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PubMed2003

Mutations in raised Drosophila melanogaster affect experience-dependent aspects of sexual behavior in both sexes.

Many aspects of the reproductive behavior of Drosophila melanogaster are modified dramatically by experience and age. Males' courtship of immature males and fertilized females decreases over time. Females' receptivity to copulation, and the behaviors that females perform and elicit, are affected by their age and sexual experience. We show that mutations in a raised stock affect all of these age- and experience-dependent aspects of male and female sexual behavior. Experience has no effect on raised males' courtship of immature males and has opposite effects on raised and wild-type males' courtship of fertilized females. In comparison to controls, raised females become sexually mature at an earlier age, and sexually mature raised virgin females copulate more quickly. Following mating, raised females elicit more courtship and remate faster and more frequently than control females.

Animals↗

PubMed1993

Sexual behavior of heterosexual men and women attending an HIV testing clinic.

The prevalence of high risk sexual behaviors was assessed among heterosexual men (n = 154) and women (n = 109) voluntarily attending an HIV testing clinic in Jerusalem. Men were found to be involved more frequently than women in nonmonogamous relationships (66% vs. 45% respectively, P < 0.001), to have more casual partners (21% vs. 11% had three or more casual partners, P < 0.01), and to report passive oral sex (71% vs. 50%, P < 0.01) and anal sex (23% vs. 12%, P < 0.05). Condom use was not a very common practice, and was higher among men than among women (57% vs. 47% in vaginal sex, and 30% vs. 19% in oral sex respectively, NS). Appropriate counselling for this population attending the clinic is advised and urgently needed.

Adolescent↗

PubMed1986

Sex-specific interactions between aggressive and sexual behavior in the rat: effects of testosterone and progesterone.

The influence of progesterone on sexual and aggressive behaviors during aggressive encounters was investigated in pairs of TP-treated male and female rats. Gonadectomized females, chronically injected with testosterone propionate (TP), showed low but consistent levels of feminine sexual behavior which alternated with aggression. Progesterone when given in addition to TP facilitated receptive and proceptive behaviors, but reduced levels of aggression. In TP-treated males, levels of aggression were the same as observed in TP-treated females. However, TP-treated males seldomly showed sexual behavior during aggressive encounters and additional treatment with progesterone did not affect their behavior. After the aggression tests, animals were tested in a social preference test in which an ovariectomized female cage mate and the opponent from the aggressive encounter served as incentives. Positive correlations between levels of aggression and social preference for an opponent were found in both sexes, although correlations only reached statistical significance when progesterone was given in addition to TP. These correlations were found in both sexes, despite the fact that group analysis revealed pronounced sex differences in social preference: males preferred to spend their time near ovariectomized female cage mates, whereas females divided their time equally among female cage mates and opponents.

Aggression↗

PubMed1994

Sexual behavior and perceived risk of AIDS among men in Kenya attending a clinic for sexually transmitted diseases.

The sexual transmission of human immunodeficiency virus type 1 (HIV-1) continues at an alarming rate in sub-Saharan Africa despite the fact that awareness of AIDS is high. One explanation for this alarming rate may be that individuals do not believe that they are personally at risk for AIDS and are not sufficiently motivated to make changes in their behavior. We conducted a cross-sectional study of men with genital ulcer disease to assess their sexual behavior and their perceived risk of AIDS. We studied 787 men between the ages of 17 and 54 years who presented to a referral clinic for sexually transmitted diseases (STDs) in Nairobi, Kenya. Of these 787 men, 188 (24%) were infected with HIV-1. Awareness of AIDS was essentially universal in this population; however, only 64 men (8%) thought that they were personally at risk of developing AIDS. A logistic regression analysis found that men who believed they were personally at risk knew someone with AIDS (odds ratio [OR], 8.9; 95% confidence interval [CI], 4.0-19.7), received information about AIDS from television or video (OR, 3.0; 95% CI, 1.7-5.5), or had previously had an STD (OR, 2.2; 95% CI, 1.2-4.1). Except for a modest increase in condom use, there was no significant difference in sexual behavior between the group who considered themselves to be at risk for AIDS and the group who did not consider themselves to be at risk. The results of this study challenge the current strategies on HIV/AIDS education and prevention for urban men in Kenya.

Acquired Immunodeficiency Syndrome↗

PubMed2006

Preoptic glutamate facilitates male sexual behavior.

The medial preoptic area (MPOA) is a critical regulatory site for the control of male sexual behavior. We first measured glutamate in 2 min microdialysate samples from the MPOA before, during, and after copulation by male rats. There was a slight [approximately 140% of baseline (BL)] rise in extracellular glutamate when the female was presented, a significant increase (approximately 170% of BL) during periods of mounting and intromitting, and a very large increase in samples collected during ejaculation (approximately 300% of BL). A precipitous fall in levels occurred in the first postejaculatory sample; the magnitude of this fall was highly correlated with the length of the postejaculatory interval of quiescence. In experiment 2, we reverse-dialyzed a mixture of glutamate uptake inhibitors into the MPOA before and during mating; control animals received artificial CSF. The mixture increased extracellular glutamate (approximately 280% of BL), increased the number of ejaculations in the 40 min test, decreased ejaculation latency, and decreased the postejaculatory latency to resume copulation. These data, together with other findings that glutamate in the MPOA can elicit genital reflexes in anesthetized rats and that glutamate receptor antagonists in the MPOA impair copulation, strongly suggest that MPOA glutamate is a major facilitator of copulation and that the postejaculatory fall in glutamate regulates the postejaculatory interval.

Animals↗

PubMed1989

Differential effects of dopamine receptor antagonists on the sexual behavior of male rats.

In the present experiments, the dose-response effects of the dopamine (DA) receptor antagonists haloperidol, pimozide, clozapine, sulpiride, and metoclopramide, were assessed on patterns of copulatory behavior in intact, sexually active male rats with a high level of sexual experience and performance. The typical neuroleptics haloperidol (0.01-0.5 mg/kg) and pimozide (0.1-5.0 mg/kg) dose-dependently delayed the initiation of copulation and reduced the number of intromissions that preceded ejaculation. The atypical neuroleptics clozapine (0.1-5.0 mg/kg), and sulpiride (0.1-5.0 mg/kg) dose-dependently delayed the initiation of copulation but had no effect on copulatory behavior once it was initiated. In contrast, metoclopramide dose-dependently reduced ejaculation but had no effect on the ability of rats to initiate copulation. These experiments suggest that aspects of copulatory behavior in male rats are affected differently by DA antagonists depending upon their site of action in the brain. Blockade of mesolimbic DA receptors by typical and atypical neuroleptics may delay the initiation of copulation, whereas blockade of mesostriatal DA receptors by typical neuroleptics and metoclopramide may decrease the ejaculation threshold.

Animals↗

PubMed1998

Effects of chronic low-dose ethanol intake on sexual behavior in rats.

The effects of 8-week ethanol intake (3% v/v in drinking water) on the sexual activity of male rats were investigated during three experimental sessions with 15-day intersession intervals. Chronic ethanol consumption did not significantly influence any copulatory parameter during the three experimental sessions. The evaluation of ultrasonic emission during sexual behavior showed that rats treated with ethanol exhibited a significant increase of the postejaculatory vocalization length during the third test session. These results indicate that the chronic intake of low doses of ethanol, which does not induce either tolerance or dependence, only slightly affects the motivational state of male rats during sexual activity.

Animals↗

PubMed1999

Sexual behaviors and reproductive health outcomes: associations with wife abuse in India.

CONTEXT: Wife abuse has been associated with a variety of health concerns. Associations between abuse and reproductive health in India are not well known. OBJECTIVE: To examine relationships between men's reports of wife abuse and reproductive health issues in northern India. DESIGN: Structured face-to-face interviews were conducted as part of the male reproductive health supplement of the PERFORM System of Indicators Survey, a systematic multistage survey conducted in 1995-1996. SETTING: The northern state of Uttar Pradesh, one of the least developed states in India. PARTICIPANTS: A total of 6632 married men aged 15 to 65 years who lived with their wives and completed all survey questions for the study variables reported here. MAIN MEASURES: Physically and sexually abusive behaviors toward wives, sexual activities outside marriage, sexually transmitted disease (STD) symptoms, contraception use, unplanned pregnancies, and sociodemographic characteristics. RESULTS: Fifty-four percent of men reported not abusing their wives, while 17% reported physically but not sexually abusing their wives, 22% reported sexual abuse without physical force, and 7% reported sexual abuse with physical force. Abuse was more common among men who had extramarital sex (for sexual abuse using force: odds ratio [OR], 6.22; 95% confidence interval [CI], 3.98-9.72). Similarly, men who had STD symptoms were more likely to abuse their wives (with current symptoms: OR, 2.43; 95% CI, 1.73-3.42). Unplanned pregnancies were significantly more common among wives of abusive men, especially sexually abusive men who used force (OR, 2.62; 95% CI, 1.91-3.60). CONCLUSIONS: Wife abuse appears to be fairly common in northern India. Our findings that abusive men were more likely to engage in extramarital sex and have STD symptoms suggest that these men may be acquiring STDs from their extramarital relationships, thereby placing their wives at risk for STD acquisition, sometimes via sexual abuse. These abusive sexual behaviors also may result in an elevated rate of unplanned pregnancies.

Adolescent↗

PubMed1993

Adolescent sexual behavior and condom use in Ile-Ife, Nigeria.

A study to identify risky sexual behaviors related to condom use was conducted in a Yoruba-speaking urban area of Nigeria. The subjects were 256 randomly selected male high school students, 15-19 years of age, who completed a self-administered questionnaire. The majority (79%, or 194) reported having had heterosexual intercourse in the previous 12 months, 9 (4.6%) with prostitutes and 107 (55.4%) with more than one sexual partner. Three subjects who had more than one sexual partner and 1 of the 9 who had sexual intercourse with a prostitute had used a condom. Condoms were reported to be used only for the prevention of unwanted pregnancy by 61.3% of the students. Implications of these findings for adolescent AIDS education in Africa are discussed.

Adolescent↗

PubMed1996

Effects of paced mating and intromissive stimulation on feminine sexual behavior and estrus termination in the cycling rat.

The effects of differential mating stimulation on sexual behavior and estrus length were examined in cycling rats that could or could not self-regulate, or pace, the timing of sexual contact. Female rats (Rattus norvegicus) received 30 paced, 30 nonpaced, or 15 nonpaced followed by 15 paced intromissions during mating tests. Decreases in sexual responsiveness were seen during the second half of testing; pacing was associated with greater inter-intromission intervals, decreased proceptivity, and increased rejection behavior at this time. Female rats pacing during the second test half behaved similarly, regardless of prior treatment, showing that the number rather than the timing of prior intromissions affected subsequent behavior. However, estrus length was decreased by prior paced mating. These data suggest that changes in sexual responsivity occur throughout estrus and that the nature of these changes is differentially dependent on the type of mating stimulation received.

Animals↗

PubMedDate not supplied

Sexual behaviors of aging female rats: influence of age and hormonal state of male partners.

Proceptive and receptive behaviors were examined in aging and young ovariectomized female rats treated with estradiol benzoate and progesterone. Young females approached males confined in wire mesh cages more frequently and exhibited more proceptive behaviors toward these males than did middle-aged females. Both middle-aged and young females approached young males more often than they approached old males, but young females showed greater preferences for young males and for males with high levels of testosterone than did middle-aged females. Young females also exhibited more proceptive behaviors than did middle-aged and old females during tests of sexual behavior. The frequencies of lordosis responses, however, did not differ among these three groups of females.

Aging↗

PubMedDate not supplied

[The effect of bromantan on the sexual behavior and conception in rats].

The results of experiments on rats showed that the psychotropic drug bromantan affects the sexual behavior and pairing activity. A three-day treatment with bromantan (30 and 300 mg/kg, p.o.) predominantly increased the sexual proceptivity, whereas a chronic administration (for 2 months in males and 2 weeks in females) produced a dose-dependent increase in both proceptivity and receptivity. The observed effects are probably related to the dopamine-positive action of bromantan.

Amantadine↗

PubMed1992

Sexual behavior and risk factors for HIV infection in a group of male factory workers who donated blood in Harare, Zimbabwe.

Zimbabwe has experienced a rapid rise in HIV seroprevalence in recent years. As many as 1 million people (10% of the population) are predicted to become seropositive by 2000. We examined social and behavioral factors associated with HIV infection in a case-control study among male factory workers who donated blood before the launching of the AIDS Awareness Campaign. There were 188 subjects: 69 were HIV-positive and 119 were HIV-negative. High-risk behavior was common in both groups. Among seronegative men, 73.1% reported a sexually transmitted disease (STD), 55.5% reported cash payment for sex, and 73.1% had outside girlfriends. Nonetheless, HIV-positive men were more likely to report a history of STD (OR = 3.9; 95% CI = 1.5-11.9), particularly genital ulcers (OR = 2.4; 95% CI = 1.2-4.8), and extramarital partners (OR = 2.8; 95% CI = 1.1-7.1). HIV-positive men reported more lifetime partners (16.5 vs. 12; p less than 0.05) and were less likely to live with their wives (OR = 0.51; 95% CI = 0.23-1.15). Our findings support the importance of genital ulcer as a risk factor and suggest widespread high-risk sexual behavior among urban working-class men.

Adult↗

PubMed1998

The inter-relationship between gonadal steroids and POMC peptides, beta-endorphin and alpha-MSH, in the control of sexual behavior in the female rat.

Estradiol benzoate (10 microg EB) given to ovariectomized-adrenalectomized rats induced sexual receptivity in half the animals and increased alpha-MSH in the preoptic area, ventromedial nucleus (VMN) and arcuate nucleus (ARC), in all the animals, although levels were significantly higher in the VMN and ARC of the receptive (R) subgroup. EB also raised levels of beta-endorphin in the VMN and ARC in the R rats only. POMC expression was not altered. EB did not affect alphaMSH in extra-hypothalamic areas, but addition of progesterone, raised levels in the septum, amygdala, hippocampus and caudate putamen. Only in the VMN, ARC and septum were the steroid-induced increases correlated with onset of sexual behavior.

Animals↗

PubMed2005

Validation of Acceptance of Coercive Sexual Behavior (ACSB): a multimedia measure of adolescent dating attitudes.

The psychometric properties of the Acceptance of Coercive Sexual Behavior (ACSB), a multimedia measure of adolescent dating attitudes, were examined. The ACSB is an interactive instrument that uses video vignettes to depict adolescent dating situations. Analyses of the measure's factor structure, internal consistency, test-retest reliability, and validity were conducted with separate samples of male (n = 106) and female (n = 114) high school students. Validity was evaluated in relation to subscales on the Sexual Attitudes Survey and self-reports of dating and sexual experiences. Factor analyses on the ACSB yielded two factors, Coercion and Consent. The ACSB demonstrated acceptable psychometric properties. Advantages of using a multimedia assessment of sexually coercive attitudes with adolescents are discussed.

Adolescent↗

PubMed2002

Holding the line with a watchful eye: the impact of perceived parental permissiveness and parental monitoring on risky sexual behavior among adolescents in psychiatric care.

Adolescents in psychiatric care are at increased risk of HIV, yet little is known about the family factors related to sexual risk taking among these youth. We explored whether perceived parental monitoring and perceived parental permissiveness were linked to high-risk sexual behavior in 169 ethnically diverse urban youth seeking mental health services in Chicago, and we tested whether adolescent gender moderated these associations. We evaluated sexual risk taking at a global level and for specific risk behaviors (e.g., sex without a condom, sex while using drugs and alcohol). Girls reported more risky sex overall than boys, and girls were more likely than boys to report having sex without a condom. At low levels of parental permissiveness, rates of risky sex among boys and girls' did not differ, but at high levels of permissiveness girls reported more sexual risk taking than boys, and girls were more likely than boys to report having sex while using drugs and alcohol and having sex without a condom. Findings highlight the complexity of adolescent sexual behavior and the need for multilevel assessment of risk taking. Results suggest that parental monitoring and permissiveness are more strongly associated with sexual risk taking in troubled girls than troubled boys, and they underscore a need for gender-sensitive, family-focused HIV-prevention programs.

Adolescent↗

PubMed1990

Effects of lesions of a sexually dimorphic nucleus in the preoptic/anterior hypothalamic area on the expression of androgen- and estrogen-dependent sexual behaviors in male ferrets.

The male nucleus of the preoptic/anterior hypothalamic area (MN-POA/AH) is a sexually dimorphic structure present in male, but not in female ferrets. Ovariectomized female ferrets given increasing dosages of estradiol benzoate (EB) normally run faster towards a stud male in an L-maze (i.e. become more proceptive). In two separate experiments, only gonadectomized males with bilateral damage to the MN-POA/AH following large or small electrolytic lesions approached stud males more quickly in response to EB. By contrast, males which received sham lesions, unilateral large POA/AH lesions, or bilateral lesions which missed the MN-POA/AH on at least one side failed to show EB-induced reductions in approach latencies in pre- or post-operative tests. Males with large POA/AH lesions also displayed significant post-operative decrements in masculine sexual behaviors during treatment with a high dose of testosterone propionate (TP). Less severe, but statistically significant deficits in masculine coital performance were also observed in males with small lesions which damaged the MN-POA/AH bilaterally; however, the ability of these males to achieve intromissions appeared normal. Together, these results suggest that the MN-POA/AH of the male ferret exerts an inhibitory influence on estrogen-dependent proceptive responsiveness, but play only a minor role in the control of masculine coital behavior.

Animals↗

PubMed1990

Methodological problems in AIDS behavioral research: influences on measurement error and participation bias in studies of sexual behavior.

An unprecedented number of human sexuality studies have been initiated in response to the acquired immune deficiency syndrome (AIDS) epidemic. Unfortunately, methodological developments in the field of sex research have been slow in meeting the demands of AIDS investigations focusing on the diverse populations at risk for infection with the human immunodeficiency virus (e.g., adolescents, gay men, intravenous-drug users, ethnic minorities, elderly transfusees). In this article, we review and integrate current literature on measurement error and participation bias in sex research, with an emphasis on collecting sexual information in the context of AIDS. The relevance of these findings for AIDS-related sex research is discussed, and recommendations are made to guide future investigations.

Acquired Immunodeficiency Syndrome↗