To this very day, scientist still haven't figured out why the anus is so stinky. Researchers have plunnged deep into the anus chamber, explored the anus canals, examined every wrinkle of the anus rim...and still they are left in confusion. But i have a theory...a larger taint surface area will produce a foul order...thats why people born without taints dont have a stinky cheese ring!

It's just so round and soft

The deal is that for at least the last 80 million years since mammals evolved, until the last few thousand years, without wanting to get graphic or specific, sex has taken place in a way that has the male seeing the female posterior during the act. It is still common but no longer universal as it was for millions of years. If one of our ancestors liked that, he might father more children and we would inherit more of his genetics. If one of our ancestors didn't like that - he probably wouldn't be one of our ancestors, because he wouldn't be as likely to reproduce, so we would get less genetic material from him. Compound that over millions of generations. File this under "things they can't think how to tell you in school without lawsuits, not that female teachers would want to say it anyway."

This made me laugh so -blam!-ing hard