A man’s sex drive will only become active if it is ‘primed’ by testosterone, secreted by his testes at puberty. The continuation of the drive is from stimuli, which are interpreted as erotic by the ‘old brain’, triggering the physical aspects of the sexual response, particularly erection, ejaculation, and orgasm.
Unless male sex hormone continues to be secreted, the ability to ejaculate diminishes, and in some cases all the sexual urge is also lost. In reported cases of men castrated after puberty there is a very great variation in the time taken for the sexual urge and penile erections to go, if they cease at all. In some men they go quickly, only weeks after castration. Other men retain their sexual potency for years, or for life. What one needs to know is whether men who retain their potency continue to secrete male sex hormones, presumably from their adrenal gland. Until this is known the place of testosterone in the continuation of the sex drive will remain obscure. At present the evidence is that it plays a very small part, once the drive has been primed at puberty. After this a man’s sex drive is maintained by emotional impulses which stimulate the sex centre in the brain, and initiate the sexual response.
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