The word that throws me off is "normal" what is that? What is is normal for one is not for another.

I agree, and add...if he finds it disgusting, he ought not to inquire.

Sex also shows dominance in society. Not so much by females but by males.

Ummm wrong. It may be a man's world to men, but if not for women there would BE no men...and fact is, if men were honest, they'd admit when it comes to sex, women have much more sway in the say so (although as a woman, I'd argue that point...no feminist haters, please lol)

. Sex can relieve headaches, so when women say no I have a headache the body releases natural hormones that relieve pain.

Interesting theory, although honestly....if I have a headache (and that has never stopped me from having sex if I'm with someone I love and want) and have an orgasm, it makes my head split wide open. Glorious agony.