Hell, I be making sperm every time i bone a female.
Biologically, sperm is an essential ingredient of reproduction.
A woman can be in the privacy and comfort of her own home.
While feminists like to exaggerate the bad properties and general uselessness of men and the superior characteristics of women, they fail to realize that those properties have been genetically selected by their sexual counterpart.
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Next, during the process of spermatogenesis chromosomal crossover introduces genetic variability.
You can't suddenly replace that in a generation.
Lastly, auto-reproduction is nearly impossible.