Maybe am wrong but, i saw that it takes 70 days for sperm to mature, that would take you not masturbating for a long while to have well developed fertile sperm.

So, masturbation makes us infertile? sure, we produce multiple millions of sperm a day but, they quality of that sperm is not to be desired. you can even say infertile levels.

Maybe there is a reason why, they told the man of old not to masturbate, and porn/hentai has warped our minds to sex. it's just observation, not pushing ideals