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PubMed1997

Aromatase inhibition blocks the activation and sexual differentiation of appetitive male sexual behavior in Japanese quail.

Two experiments investigated the role of estrogens in the activation and sexual differentiation of appetitive sexual behavior (ASB) in Japanese quail (Coturnix japonica) as measured by a learned social proximity response. Injection of the aromatase inhibitor R767 13 in castrated, testosterone (T)-treated male quail completely suppressed ASB, confirming that, like consummatory sexual behavior, ASB is mediated by T aromatization. ASB is not observed in female quail, even if they are treated with T as adults. The role of embryonic estrogens in the sexual differentiation of ASB was tested by blocking estrogen synthesis in ovo. Control male and T-treated female quail deprived of estrogens during embryonic life learned the social proximity response used to assess ASB, whereas control female quail did not, despite the presence of high T. Thus, ASB is demasculinized by the action of embryonic estrogens during ontogeny as is consummatory behavior.

Animals↗

PubMedDate not supplied

Reported changes in the sexual behavior of men at risk for AIDS, San Francisco, 1982-84--the AIDS Behavioral Research Project.

We surveyed 454 men in November 1983 and in May 1984 regarding their sexual practices during the month before the survey. In the 1983 survey, we also asked for reports about sexual behavior during the same month 1 year prior to the survey. The sample consisted of men recruited as they left bath-houses and bars, men who had not used bars or baths for meeting sexual partners for 2 months prior to the November 1983 survey, and men in committed primary relationships with another man. We found substantial changes in reported sexual behavior with persons other than a primary partner. The average number of male partners declined from 6.3 in November 1982 to 3.9 in May 1984. Receptive anal intercourse without condom declined from 1.9 to 0.7, oral-anal contact declined from 1.1 to 0.3, and swallowing semen declined from 2.8 to 0.7 in terms of the number of times that the respondent engaged in the act in the last month. These same changes did not occur in relation to sex with a primary partner. Only one variable, namely, increased length of time since the first homosexual experience, distinguished persons maintaining few sexual partners from those increasing the number of sexual partners from November 1983 to May 1984. Four variables distinguished those retaining high numbers of sexual partners from those lowering the number of sexual partners, namely, ability to remember a visual image of AIDS deterioration, age, relationship status, and length of time since first homosexual experience.

Acquired Immunodeficiency Syndrome↗

PubMedDate not supplied

The sexual behavior of men in the United States.

A nationally representative study of the sexual behavior of men aged 20-39 in the United States shows that the prevalence and frequency of sexual acts (vaginal, anal and oral) and sexual orientation vary by social and demographic characteristics. Analysis of data from 3,321 respondents to the 1991 National Survey of Men reveals that 95% of men have had vaginal intercourse; among them, 23% have had 20 or more vaginal sex partners in their lifetime. About one-fifth of never-married and formerly married men had four or more partners over a recent 18-month period. However, 41% of never-married men and 32% of formerly married men did not have coitus during the four weeks preceding the interview. Only 20% of men have ever engaged in anal intercourse. Among these, 51% had not done so during the previous 18 months, and 90% had not done so during the previous four weeks. Seventy-five percent of men have performed oral sex and 79% have received oral sex, although 53% of men who ever performed oral sex had not done so during the four weeks prior to interview, and only 11% had done so six or more times. The frequency of receiving oral sex is similar. Only 2% of sexually active men aged 20-39 have had any same-gender sexual activity during the last 10 years, and only 1% reported being exclusively homosexual during this interval.

Acquired Immunodeficiency Syndrome↗

PubMed1985

Ontogeny of aggressive-sexual behavior between males in lines of Japanese quail (Coturnix coturnix japonica) selected for male mating frequency.

Japanese quail from lines bidirectionally selected for high and low male mating frequency and from the random-bred base population were observed in an ontogenetic study of aggressive-sexual behavior. Quail were reared in sex-intermingled flocks until 28 days of age at which time half of the males from each line were housed as all-male flocks and half were transferred to individual cages. At 41 days of age, individually caged males exhibited mounting behavior to win encounters with other males. By 45 days, males from the high and control lines exhibited significantly more aggressive-sexual behavior than those from the low lines. Line x Rearing Experience interactions for mounting behavior at 45 and 56 days of age were due to the individually caged high- and control-line males' winning encounters by mounts; those maintained in flocks rarely mounted. Although some low-line males won encounters by mounts, occurrence of this behavior was infrequent. Males maintained in flocks were placed in individual cages at 57 days of age. When these males were compared with those housed in individual cages from 28 days of age, at 84 days of age and older, the Line x Rearing Experience interaction observed previously disappeared, and only differences among genetic lines were evident. Genetic and rearing experience effects are discussed as influencing agonistic and sexual behaviors.

Age Factors↗

PubMed1999

Rehousing periadolescent male guinea pigs (Cavia porcellus) apart from their mothers for 24 hours increases maternally directed sexual behavior and plasma testosterone.

Periadolescent male guinea pigs (Cavia porcellus) housed continuously with their mother displayed little or no sexual behavior when they were tested with her in a novel environment. However, if males were rehoused without their mother for 24 hr before testing, they frequently directed courtship and sexual behavior toward her. This effect occurred whether the mother was isolated or not during the rehousing period. In addition, rehousing without the mother produced a significant rise in the plasma testosterone levels of the males. It appears that continuous housing with the mother inhibits sexual and courtship behavior directed toward her, as well as gonadal activity, in periadolescent male guinea pigs. These effects may serve to prevent inbreeding.

Animals↗

PubMed2006

Reproductive and sexual behavioral problems in dogs.

This paper reviews the influence of genetics on canine sexual behavior, the causes of common sexual and reproductive behavioral problems in dogs as well as treatment approaches, including environmental management, behavior modification, and pharmacological intervention.

Aggression↗

PubMed1990

Strategies for modifying sexual behavior for primary and secondary prevention of HIV disease.

Sexual behavior change is needed for both the primary and secondary prevention of HIV disease. Remarkable progress has been made in modifying high-risk behaviors in selected populations (e.g., gay men living in the epicenters of the epidemic). However, many at-risk populations (e.g., gay men living outside these epicenters, homosexual men who are young or Black, ethnic minorities--especially women of childbearing age, and persons over age 50) have received relatively little research attention and may be at risk for further infection. A community-level approach to behavior change represents one kind of comprehensive strategy to achieve significant reduction in the spread of HIV. Effective approaches at this level require component interventions that are effective in changing behavior and acceptable to target populations. Also needed is an infrastructure to support behavioral change efforts. Lacking at present is a comprehensive and coordinated structure to conceptualize, stimulate, and support the continuum of behavioral research needed for the control of HIV and other sexually transmitted diseases.

Acquired Immunodeficiency Syndrome↗

PubMed1997

Restoration of sexual behavior in aged male rats by intracerebral grafts of fetal preoptic area neurons.

A decline in sexual arousal and copulatory activity has been observed in male rats with advancing age. Grafting of fetal hypothalamic tissue into the third ventricle of aged male rats restores sexual behavior. This study investigated the effects of grafting fetal preoptic area (POA) neurons into the POA of aged male rats exhibiting decreased sexual behavior. We grafted suspensions of fetal POA neurons into the POA of 20 aged (19 to 24 months old) male rats that displayed no ejaculation. From 2 weeks after grafting, one or more series of male copulatory activity and sexual motivation tests were performed at intervals of 3 to 4 weeks. Three behavioral tests given 5 days apart were repeated for each animal in each series. Among the 20 aged rats with the fetal grafts, 15 showed improved sexual motivation, and 14 of these had copulatory activity restored to levels comparable with those of young males. Among these 14 rats, eight ejaculated during copulation. Copulatory behavior was restored between 21 and 45 days after grafting and persisted until the end of observation (2-4.5 months). Sexual performance did not improve in control aged male rats grafted with either fetal cerebral cortex neurons into the POA or POA, neurons into the ventromedial hypothalamus. The rats that received grafts of fetal POA neurons into the POA and recovered sexual performance also showed improvement or recovery to levels comparable to those in young males of serum testosterone concentrations, serum luteinizing hormone levels after castration, and the post-castration rise in luteinizing hormone. These results indicate that decreases in copulatory activity, sexual motivation, and some neuroendocrine functions in aged male rats are at least partially due to dysfunction of the POA.

Aging↗

PubMedDate not supplied

Prenatal dexamethasone or stress but not ACTH or corticosterone alter sexual behavior in male rats.

Prenatal maternal stress in rats and mice can demasculinize and feminize the sexual behavior of adult male offspring. Causal mechanisms are unknown, but one attractive hypothesis is that stress activation of maternal adrenal glucocorticoid secretion is the responsible agent. To test this hypothesis, pregnant rats were exposed to a variety of substances which enhance glucocorticoid actions. These included ACTH (20 IU of a gel preparation, SC once daily), corticosterone (CORT; 7 mg/kg SC in oil, three times daily), or dexamethasone (DEX; 0.1 mg/kg, SC once daily). Controls included noninjected dams and a positive stress control group (restraint under bright lights three times daily). All treatments reduced maternal weight gain, DEX most potently. No treatment altered litter size, stillbirths, or sex ratio, but DEX reduced weight at birth, an effect still seen at postnatal day 85. DEX, CORT, and stress reduced male adrenal weight at birth, while DEX and CORT altered sexual differentiation as measured by anogenital distance. Stress impaired adult male sexual performance but not the lordosis quotient following exposure of animals to stud males. DEX affected both measures. No other treatment had any significant effect on sexual behavior. No treatment altered plasma LH levels, either basal or in response to an estrogen challenge in adult gonadectomized males. In adulthood there was no treatment effect on stress reactivity, measured behaviorally or by plasma glucocorticoids. Correlational analysis revealed that weight gain during pregnancy was the single best predictor of subsequent sexual performance. It is concluded that prenatal dexamethasone exposure demasculinizes and feminizes male offspring.(ABSTRACT TRUNCATED AT 250 WORDS)

Adrenal Glands↗

PubMed1999

Facilitation of sexual behavior in French-Alpine goats treated with intravaginal progesterone-releasing devices and estradiol during the breeding and nonbreeding seasons.

The effectiveness of administering progesterone (P4) using controlled intravaginal drug release (CIDR) devices on estradiol (E2)-induced sexual behaviors was examined in ovariectomized (ovx) French-Alpine goats during the fall and spring. Estradiol-induced attractivity and receptivity were facilitated during the spring when P4-filled CIDR devices were removed 24 or 48 h before injection of 30 microg of E2. During the fall, attractivity was also facilitated by CIDR removal 24 h prior to E2 injection, whereas E2-induced receptivity was unaffected by removal of the CIDR at this interval. Concentrations of P4 in circulation during the 3 d of treatment with a CIDR were similar to those during the late luteal phase of the estrous cycle in intact goats. Treatment with P4-filled CIDR for 3 d, followed by injection with 30 microg of E2 24 h after removal, was determined to be a useful model for inducing sexual behavior in a physiologically relevant manner, and it may also be an effective means for facilitating estrus detection due to the high frequency of display of sexual behavior during a predictable time period following steroid treatment.

Administration, Intravaginal↗

PubMed1984

Sexual deprivation and its influence on testosterone levels and sexual behavior of old and middle-aged rhesus males.

After approximately 6 mo without access to a receptive female, eight old (19 to 25 yr) and eight middle-aged (9 to 15 yr) males were given nine daily 10-min tests of sexual behavior with receptive females. Three ovariectomized, estrogen-primed females served as partners. Blood samples were taken from the males at 0900 and 2100 h on 2 consecutive days before and after the series of nine behavioral tests. Serum levels of testosterone (T) were measured by means of radioimmunoassay. There were no significant differences between serum T levels after 6 mo of sexual deprivation and after the nine tests of sexual behavior, nor did serum T levels differ between middle-aged and old males. Serum T levels were significantly higher in the 2100-h samples than in the 0900-h samples for both groups. The nocturnal increases in serum T, both absolute amounts and percentages of increase, did not differ between middle-aged and old males. Repeated daily testing had little effect on the major components of male sexual behavior. Middle-aged males outperformed old males; middle-aged males had higher rates of contracting the female, mounting and intromitting. They ejaculated earlier and had a greater percentage of tests with ejaculations than did old males.

Aging↗

PubMed1992

[The sexual behavior of the primates].

The article presents the review of modern data of the field and laboratory investigations of primate sexual behavior, cyclicity, reproductive strategies and copulation in different primates taxa: strepsirrhini, platyrrhyni, catarrhini. The specific character, progressiveness and adaptation of some reproductive models are discussed by the authors. A problem of connection between dominance and reproductive success is also discussed, the role of sexual teaching in postnatal ontogenesis, age and hormonal status for expression of sexual behavior are analysed. Some forms of sexual declinations in primates are considered.

Aging↗

PubMed2000

[Prevention focused on sexual behavior].

In Italy, studies on the sexual behaviour of young persons are rare, especially those conducted among samples that are representative of the same-age general population. This report presents the preliminary results of a knowledge, attitudes and practices survey on sexual behaviour among a representative sample of individuals 18-26 years of age. The study was begun in 1994, and as of 30 June 1997, 8533 (32%) of the 26,536 questionnaires sent so far have been completed: 3947 (46%) by males and 4586 (54%) by females. 70% of the males and 64% of the females reported that they are sexually active; the median age at first sexual experience is 18 years for both genders. The proportion of respondents who use condoms with occasional sexual partners is low, and only half of the respondents demonstrated an adequate level of knowledge regarding the transmission of HIV.

Adolescent↗

PubMed1992

Intracerebral actions of the 5-HT1A agonists, 8-OH-DPAT and buspirone and of the 5-HT1A partial agonist/antagonist, NAN-190, on female sexual behavior.

Proestrous rats were infused intracerebrally with 50-1000 ng 8-OH-DPAT, 500 or 2000 ng buspirone or 125-500 ng NAN-190. For each drug, bilateral infusions into the mediobasal hypothalamus inhibited female lordosis behavior and proceptivity and initiated resistive behavior. The effects of the drugs were evident within 5-20 min of infusion and generally lasted for 1-2 hr. The effective sites for 5-HT1A-mediated inhibition of sexual behavior were most concentrated in the ventromedial nucleus of the hypothalamus. Cannulae sites anterior, posterior or dorsal to the ventromedial nucleus or clearly within the IIIrd ventricle were less effective at disrupting lordosis behavior. The inhibition of sexual behavior, following 8-OH-DPAT occurred in a dose-dependent manner and appeared to include the loss of motivation of the female to mate. Buspirone produced similar, but quantitatively smaller, effects on lordosis behavior. NAN-190 slightly, but significantly, suppressed lordosis behavior after either intracerebral or intraperitoneal injection and substantially increased resistive behavior. These results suggest that the inhibition of lordosis behavior, following treatment with 5-HT1A agonists, include an action within the ventromedial nucleus. Moreover, 5-HT1A receptors in this area appear to play a functionally important role in the modulation of the female's "willingness" to mate.

8-Hydroxy-2-(di-n-propylamino)tetralin↗

PubMed2003

Self-reported alcohol use and sexual behaviors of adolescents.

Research has demonstrated a relation between alcohol use and engaging in high-risk sexual behaviors. Alcohol use, especially binge drinking, has been linked to a host of problems including high-risk sexual behavior, date rape, and academic problems. As such, the purpose of this study was to provide a descriptive profile of alcohol consumption among adolescents and to examine the relations of alcohol use (lifetime, current, binge) with sexual activity variables (sexual initiation, multiple sex partners, condom use, and pregnancy) among adolescents completing the 1993-1999 Youth Risk Behavior Survey. Analysis showed alcohol use was associated with high-risk sexual activity. Binge drinking had stronger relations with sexual activity variables than lifetime use and current use of alcohol. This result is of particular concern, in that binge drinking has been implicated in many problem behaviors. As such, it is of great importance to intervene in the high-risk practices of adolescents before problems occur.

Adolescent↗

PubMed2005

Partner awareness of the serostatus of HIV-seropositive men who have sex with men: impact on unprotected sexual behavior.

Prior research has provided conflicting evidence about the association between partner awareness of an HIV-seropositive person's serostatus and HIV transmission behavior via unprotected intercourse. The current study examined partner awareness of participant HIV-seropositive status and sexual behavior in a multiethnic sample of HIV-seropositive men who have sex with men. Most HIV-seropositive men reported that their primary partners are aware, and most reported that at least some non-primary partners are aware the participant was HIV-seropositive before first having sex. Partner awareness of participant HIV-serostatus was related to unprotected sexual behavior during the past 3 months in a non-linear fashion, as men with partners who were inconsistently aware had higher rates of unprotected receptive anal intercourse than men with partners who were consistently aware or consistently unaware. Men with partners who were inconsistently aware also had higher rates of insertive oral intercourse than men with partners who were consistently aware. However, there were no differences in HIV transmission risk behavior between men with partners who were consistently aware and men with partners who were consistently unaware a participant was HIV-seropositive.

Adult↗

PubMed1989

Perinatal administration of nicotine alters subsequent sexual behavior and testosterone levels of male rats.

The effect of pre- and/or postnatal administration of nicotine (0.25 mg/kg) on sexual behavior and testosterone levels in adult male rats was examined. Prenatal nicotine decreases male sexual behavior as measured by the number of males that mounted, intromitted or ejaculated. The males that did mount and/or ejaculate exhibited an increase in mount latency and number of mounts and a decrease in efficiency. This decrease was correlated with a decrease in plasma testosterone levels. Postnatal nicotine treatment improved the sexual performance of sexually naive males as measured by an increase in the number of males that completed 2 ejaculatory series and by a decrease in mount latency. This effect is transient, subsequent testing of the nicotine males eliminated this difference in sexual performance. Pre- and postnatal nicotine treatment did not affect the overall sexual performance of the male rats, although the number of mounts and intromissions during a second series decreased. Eye opening of male and female pups was accelerated with pre/postnatal nicotine administration. Birth weight, testis and levator ani weights, sex ratio and number of pups per litter were not affected. We suggest that nicotine may act as a neuromodulator during sexual differentiation of the brain, demasculinizing the male progeny in rats. This effect is correlated with decreased testosterone levels during adulthood.

Animals↗

PubMed1990

Influence of pinealectomy on sexual behavior of normal and monosodium L-glutamate-treated rats.

Subcutaneous injections of monosodium L-glutamate (MSG) were administered, as a neurotoxin, at a dose of 4 mg/g body weight to rat pups on days 1 and 3 postnatally. Pinealectomy was performed at 6 weeks of age, and animals were allowed to mature. The intact MSG-treated rats showed a decrease of lordosis quotient in females and a reduction of ejaculation frequency and an increase in mount frequency in males. Pinealectomy caused no significant improvement on sexual behavior of the saline-treated normal rats, but it caused a marked improvement of the sexual receptivity in MSG-treated female rats and reinstated ejaculation in MSG-treated males. The circulatory sex steroid levels, estrogen in females and androgen in males, were not significantly different between the intact and pinealectomized MSG-treated groups in the respective sexes, whereas the progesterone level in females was significantly elevated in the pinealectomized MSG-treated group compared with the intact MSG-treated group. These findings suggest that the pineal gland plays an inhibitory role on the sexual behavior of MSG-treated rats and the improvement of sexual behavior following pinealectomy may be dependent on certain mechanisms other than the actions of circulatory androgens or estrogens.

Analysis of Variance↗