*I know, I had to drive around the block a few times to find a "U" word for my theme, but it works. (Well, it works for me, anyway.) (Plus, we all know how lazy I am, so...)
Y U SO SEX-AY?
That chemical, "certain something" will attract us to our partners and, as they endear themselves to us, we find ourselves wanting to do for them, don't we? Too, being shown affection frequently makes one feel secure, beloved, and I can't think of a better foundation for sexy intercourse in a committed relationship than those two feelings right there.
Click here for more about affection.