It is widely acknowledged that sexual behaviour in humans is multifactorial. Although no attempt will be made to deal with these issues here, it should be pointed out that intrapsychic, social, somatic and cultural factors can profoundly influence sexuality. The evidence presented here serves primarily to underline the contribution of sex hormones as a determinant of sexual behaviour.

It has long been recognized that androgens play a critical role in human male sexual behaviour. Prepubescent boys do not engage in sexual activity outside the context of play. After puberty, when the testes begin to secrete androgens, sex drive and the motivation to seek sexual contact become powerful and are overtly expressed. Sexual performance and copulatory ability increase as well. The general pattern of age-dependent rise and decline of androgen levels in men corresponds to average levels of male sexual activity throughout the cycle of life. When blood levels of testosterone, especially non SHBG-bound testosterone, diminish as men age, this mirrors their usually declining sexual interest and potency (Davidson etal. 1983). These observations suggest, but do not prove, that male sexual behaviour is influenced by androgens.

Less obvious and difficult to infer from everyday observation is the role of testosterone in female sexual behaviour. Physiological testosterone levels in women, which are one tenth of those in the normal male and to which males are unresponsive, seemed to be negligible. Thus, the idea that androgens could have enhancing effects on female sexual desire and arousal received little attention until synthezised testosterone was discovered to treat (post-) menopausal (Brincat et al. 1984) or oophorectomized (Sherwin etal. 1985) women.

Hair Loss Prevention

Hair Loss Prevention

The best start to preventing hair loss is understanding the basics of hair what it is, how it grows, what system malfunctions can cause it to stop growing. And this ebook will cover the bases for you. Note that the contents here are not presented from a medical practitioner, and that any and all dietary and medical planning should be made under the guidance of your own medical and health practitioners. This content only presents overviews of hair loss prevention research for educational purposes and does not replace medical advice from a professional physician.

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