The female orgasm: eluding women's sexual partners since the Big Bang.
Sure, you may know your way around a G-spot (if she's got one) and be totally convinced that she never fakes it (new phrase: orgasm perception gap). But while Aristotle was already writing about female ejaculation back in the first-century BC, most people today are still very much in the dark when it comes to the feminine mystique. There is just so much to learn.
1. Ten to 15% of all women can't orgasm... at all
We'll just get the bad news out of the way. Anorgasmia is the inability to get off. It can be global, meaning there is no means by which she's going to orgasm, or situational -- wherein she can only peak under certain circumstances. But no matter what it is, it just sucks. Completely.
2. Getting women off took precedent over their housekeeping duties
The first electric vibrators hit the market in the early 1900s. Um, that's a decade before vacuum cleaners and electric clothes irons.
3. The sensation of an orgasm is basically the same for men and women
The penis and clitoris are homologous organs developing from the same tissue in an embryo. Whichever you have, it's connected to the spinal cord (and brain, by extension) via a pair of pudendal nerves. Same nerves, same sensations.