we start as a fight of millions to get that prized womb spot it doesn't stop - the fighting - just because one is born it slows down but it gets more complex
Maybe that's partly because when we became monogamous we replaced sperm competition with external competition.
possibly i think the basis of sperm competition is the may the best sperm win possibly without monogamy a better sperm would win outside the ring
If you look at different primates some of them have external competition for females -gorillas being the prime example. Others like chimps and bonobos go in for multiple matings and the competition is between the sperms rather than the males of the species. Physiologically we are closer to chimps than gorillas. Anyone wanting to exp-lore this further should read 'Sex at Dawn' by Christopher Ryan.