We were actually going to put an asterisk on yesterday’s Wise Guy misstatement about the labia and clitoris not needing to be erect for sex*, but we got lazy. Fortunately for us, Dannie is a great regular commenter around these here parts:
If the vulva isn’t engorged with blood, if juices aren’t flowing, the woman (typically) is not physically aroused–sound familiar (and actually, the clitoris becomes erect with arousal; huh.)?…Whoever works harder/burns more calories depends on what’s going on, not on gender. Even in the missionary position, a woman can do a whole lot more than just lie there and stare at the ceiling–especially if she wants to have anything to do with having an orgasm. Seems kind of a no-brainer to me.
*If we’re going to get technical, then engorgement isn’t absolutely necessary for intercourse to occur, but it sure helps and makes things a whole hell of a lot nicer for both partners — especially her.