The parenthetical statement by ffn, although a bit tongue-in-cheek, is largely "men want sex more than women." Which, judging by the statistical consumption of porn across the world, is resoundingly true. I get your point about not perpetuating gender stereotypes, but the whole spirit of that movement (feminism, equality, what have you) is to not perpetuate gender stereotype types where they are irrelevant - as in when sex is not directly involved (e.g. leading a corporation, programming a computer, playing with children, etc.)... But you will literally not find a field where sex is more directly involved than sex itself. Granted there are always exceptions, but the statement that "man want sex more than woman" is sexist the same way "man is physically larger than woman" or "woman have higher % body fat than man" is sexist.

In other words, it's sexist in the sense that we recognize there is a biological difference between the sexes - we're not applying it to infer men are automatically rapists, or women are automatically unable to make executive decision. So maybe instead of playing around with labeling terms that carry a lot of negative connotations, you can actually consider the circumstance and context of what is being said before you label.