[Sex and love].
Sex is established as soon as spermatozoid and ovule have met. Except for rare cases of ambiguity, you clearly see at birth whether the baby is a boy or a girl. This mere factual difference evolves into sexual identity through childhood and fully blossoms in teenagers. Is sexual maturity happily completed then? Not always. Unrational sexual pulsions and survival instincts belong to the whole animal species but for man's child, as soon as he is born and until he dies, feelings will be intimately involved with sexuality in all its various stages. Teenagers' sexuality is both the end stage of childhood sexuality, being as such full of psychological traps, and the beginning of a search for a balance between sex and love, which is perhaps our modern way of trying to achieve self-fulfilment and happiness.