Not sure who needs to hear this but we all know that a zinc deficiency lowers our immune system. Here is one of the leading causes of zinc deficiency.
Frequent sex and masturbation can be one of the key causes of zinc deficiency. David Horrobin, M.D. and Ph.D. from Oxford University, declared that, “The amount of zinc in semen is such that one ejaculation may get rid of all the zinc that can be absorbed from the intestines in one day. This has a number of consequences. Unless the amount lost is replaced by an increased dietary intake, repeated ejaculation may lead to a real zinc deficiency with various problems developing, including impotence… It is even possible, given the importance of zinc for the brain, that 19th century moralists were correct when they said that repeated masturbation could make one mad!” Also Carl C. Pfeiffer, Ph.D., M.D., in his book on zinc stated: “In a zinc-deficient adolescent, sexual excitement and excessive masturbation might precipitate insanity.”
There's a Seinfeld episode where Larry David posited the theory that the more sex men have the dumber they get. So, he was right!