Derek Hough and Joanna Krupa gave dirty dancing a new meaning with their repetitive head-in-the-crotch move on Dancing with the Stars that left even Tom Bergeron flummoxed. But to hear the Season 7 pro champ tell it, the risqué move was just part of his improvised plan of attack to win the mambo marathon — and they did. Find out what else the 24-year-old has to say about their stellar week, why it would be "mind-blowing" to win and what special performance he has in store for the results show.

TVGuide.com: We have to first talk about the mambo marathon and that head-bobbing move you guys did.
Derek Hough: [Laughs] Everybody's like, "What the heck is that? It's so sexual!" Well, I didn't mean for it to look that way! There's a move in the mambo where she hinges back and you go down, flip your leg over and bring her back up. But as I was looking around, I was like, "Oh, we can't just do our routine. We've got to do something different, something that kind of eggs the audience on a little bit." So I did that move and just kind of kept her down there and she kept trying to come back up and I was like, "Nope!" It was pretty funny. She did an amazing job.

Dancing's Joanna Krupa strips down for Playboy

TVGuide.com: How much of those four minutes was improvised and how much was choreographed?
Hough: I did a minute-long routine and then we just repeated it. When it was getting closer [to the end], we knew we really had to up our game, so I just started doing the most exciting parts. It was a total freestyle. She just starting grooving out and I was like, "OK, I'll groove out with you." So I grabbed her and started shouting out stuff: "OK, here comes the pretzel! Here comes the dip!" It was all out of order, but she was wanting it and just did a great job.

More of this Q&A.... http://www.tvguide.com/Dancing-Stars/Dancings-Derek-Hough-1011434.aspx