I do think that well written relationships make you see both people in the couple as a single entity, which in turn makes it harder to sexualize either person because it's almost like you're breaking them up to do it. Unless you're into threesomes :-P

Actually, you're not the one sullying something pure, the bedroom scene is wonderful, unashamed filth. Whedon himself said that the line "You make me come-plete" is the dirtiest thing he ever wrote :-)