Sexual activity can affect testosterone levels, taking part in competitive activities can cause a man’s testosterone levels to rise or fall.
High level of testosterone testosterone can lead to infertility. Higher testosterone levels may be responsible for higher levels of antibodies in the seminal fluids which might ultimately inhibit the motility of spermatozoa. High levels of testosterone stimulate the humoral immune response, and hence ASA (antisperm antibodies) production which causes a reduction in sperm motility. High testosterone levels in men may also lower the overall production of sperm.
In females taken anabolic steroids during pregnancy, can affect fetal development by causing the development of male features in the female fetus and female features in the male fetus. High level of testosterone in female also can lead to infertility due to lack of ovulation.