Season 6
We already knew Ryan was aces at ballroom, and that Kathryn was a stellar dancer period. But when these two kids got together for a Jason Gilkison cha-cha, we definitely understood why these two hotsy totsies couldn't keep their hands off each other. (With all due respect to Ryan's wife, Ashleigh, of course.) The final pose, with Kathryn ramrod straight and facing the floor, was the exclamation point on a most sexy sentence. —Adam B. Vary

Watch it here.