Like Pandora, we may be attracted to - if not obsessed with - the very thing we're warned away from, the very thing we're denied. Sometimes even beyond our own common sense or self-interest.
Like Bluebeard's wives, the door we must never open becomes the door we must open -- though we know it be to our doom.
Neanderthals disappeared about 30,000 years ago. Oddly enough, that's about the same time as this dildo (the world's oldest) was fashioned. Coincidence? Or did the discovery of sex toys eliminate Homo sapiens' taste for sex with Homo neanderthalensis?
I prefer to imagine a lot more give and take in such a scenario: some enlightened styles sure, but some freaky animalistic carrying ons, as well. It's sex with another species for cryin' out loud -- by its very nature, taboo-busting, instinctually stinky, and no holds barred.