Testosterone and progesterone, when administered together, will suppress the signals from the brain to the testes to make sperm, and in about 90 percent of men, sperm production after three to four months will stop.
A testosterona e a proxesterona, administradas á vez, reprimen os sinais do cerebro aos testículos para crearen esperma, e nun 90 % dos homes, a produción cesa despois de 3-4 meses.