Individuals tend to think of evolution in the context of that which they are familiar. Remember that humans are the product of three hundred thousand years of evolution, of which the last 3,000 years were civilised. And in many cases, civilisation only has happened in the last few hundred years. We cannot write about gang-bangs, because the natural state of women until relatively recent time was to have sex with a number of men. The natural state of women was to not be tied down to any one partner, but to pick and choose when it suited them. Our society is a bit like this now, and women have never been truly faithful to their partners. Even species thought to be faithful like swans, through dna testing are now known to be unfaithful.
On a different track, the female birth canal and vagina is relatively large to deliver a baby with a large head which leads extraordiary intelligence relative to other species, and it's going to take a large cock to fill that large birth canal, isn't it?
On a different track, the female birth canal and vagina is relatively large to deliver a baby with a large head which leads extraordiary intelligence relative to other species, and it's going to take a large cock to fill that large birth canal, isn't it?
