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Temporary sterility is a common side effect of steroids in both males and females. In fact, anabolic steroids are so proficient at this that they have actually been studied and approved by the World Health Organization as a male contraceptive possibility. Steroids do this by disrupting the various hormones in women which potentiate the ability to have regular menstrual cycles. In men, steroids lower Follicle Stimulating Hormone (FSH) to the point where normal production of sperm is not possible. This isn´t to say that nobody on a cycle has every conceived; quite the opposite, actually. There’ ve been legions of “happy accidents” reported to me by athletes who were on cycles and thought they couldn´t possibly conceive.