There's a corollary to the rule you learned in Chapter 9 about being civilized on the morning after your wedding; however, this corollary works all the time, not just on that one morning:
If you get horny, don't try to be civilized, at least if you're alone with someone you love.
(And if you don't believe Clayton's Corollary, go back and reread Chapter 7, then just try to imagine what happened between this chapter and the last.)