Originally Posted by LaoTzu

Because some millions of years ago humans started walking upright. That meant that when a female was in heat it was less readily obvious because her twat was now between her legs instead of sticking out there engorged and red. Think brightly colored baboon ass.

It's believe by some scientists of evolution that red lips stimulate a male sexual response in the same way a female primate's red swolen genitalia would back in the day.

Women wear lipstick to elicit a sexular response from men by making their faces look like a primitive twat.