What do non-human mammalian species have to do with anything? Few things vary across species more than sexual behavior. Even chimps and bonobos (very closely re

What do non-human mammalian species have to do with anything? Few things vary across species more than sexual behavior. Even chimps and bonobos (very closely related, same genus) have wildly different gender roles, sexual/mating patterns, etc. It makes no sense at all to invoke the entire of mammalia.