Can we assume that the lowering of sperm would coincide with testosterone levels? and would these article tell us something about this?
7. Does masturbation affect fertility?
Masturbation is not different from normal intercourse in that an orgasm causes ejaculation whether it is the result of masturbation or sexual relations. When fertility is a concern, masturbation should not be practiced around the time of the wife’s fertile period. Theoretically, this can decrease the sperm reserve in an individual with a low or low-normal count and thus reduce semen quality at the time that the highest quality is needed - when the wife is ovulating. However, masturbation will not have a long-term injurious effect on the testes.
5. Does using a hot tub affect my fertility?
Excess heat applied to the testicles of animals does indeed cause a decrease in sperm production. A study in California showed that men who used hot tubs experienced q drop in sperm production. However, when the heat is avoided for several months, sperm production should return to normal. The production of sperm is a process requiring approximately three months. Consequently, when any condition or factor injurious to production of sperm is removed, a change in sperm quantity or quality should not be expected for a minimum of three months.