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I guess if you were an attractive male your opportunity to mate would be much greater than an unattractive male. So in terms of breeding your sperm never needed to be better quality because you had ample opportunity to spread your seed. Where as the less attractive males didn't have that luxury and would have naturally developed a more potent ammo to get the job done on what few occasion presented themselves.
If that were true can we grade someones ancestral attractiveness by their sperms count,
low your a good looking bunch, high and your a bunch of tr0lls.