Back Up

In the past I've talked about breasts as ass-analog, necessary since we're upright-walkers, a theory most people are familiar with these days. What isn't talked about as much is that the ass, as we know it, is also a product of our upright carriage.

If we take a look at most apes, they rely on color more than size to call attention to the female ass. Baboons have mostly flat asses, but colorful, and when the female goes into estrus, her, ahem, cunny is so red, well, you might even say it glows.

Of course, chimpanzees, our closest neighbor sexually, do rely primarily on size to call attention to the ass. Especially during estrus, when the female's entire ass region blows up into a huge balloon.

Flash forward to humans, who needed to reinvent our entire musculature for walking upright. Guess what we needed more than anything else: lots of muscle in the ass. For chimp-like minds, this would look like a female who is constantly in a state of estrus, always ready for sex. And coincidentally, she is. Humans are among a very select group of species whose females don't go through "heat" per se, but are constantly cycling. I wonder whether the ass led to that, since males were getting too many false positive signals, so the more successful females were those that turned the false positives into true positives.

Ah, ass, is there any better example of form and function?