I know other factors are involved as well but you're going to find that generally, in the wild, bigger individuals (of almost anything) are genetically superior. The inferior ones have died in one form or another because of natural selection. The ones left, on average, should have the best genes in the pool.
You don't see whitetail does sneaking small spiker bucks out back to get silly with. You don't see a big female brown trying to mate with the smallest male they can find. They instinctively know that the best chance at the survival of their offspring is to mate with the strongest, and often biggest individual.
Of course, when we move this model to humans, it often falls short, considering a woman's best chance at the survival of her offspring is to start dating the captain of the chess or debate teams.
Cheers.
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