Primarily because we don\'t produce as much progesterone as a woman does. Progesterone serum levels in men gen < 6nmol/L while in females < 10nmol/L in the follicular phase, and > 30nmol/L in luteal phase. Progesterone does impart effect on HPTA(hypothalamus-pituitary-testicular axis(other wise known as the switch controlling hormone function)) can lower LH/Testosterone production.
Also Testosterone is a very potent hormone, when it is active it dominates, when its metabolite DHT is present it even goes so far as to block the effects of estrogen. Now in a normal un modified male progesterone does effect Test levels. However in males supplementing androgens/anabolics, the Test maintains a half life of days compared to hours(so it maintains primary effects due to increased androgen/estrogen ratio). As it wears on it can aromatize to estrogen, or 5alpha reduce to DHT. Anabolics do increase progesterone, which shows it does have a role in HPTA. But since the androgen is supplemented and not being physically produced, the effects may not be felt till the point that it has returned to normal.
I have heard some funny statements, and questions. Best is \"I heard steroids shrink your willy, is that true?\" I responded \"no, actually the opposite, androgens can make it grow if your genetics permit\" Her response \"Prove it\"
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