I think you're close on this one. I believe it was the Dating Game. The host (Bob?) asked the question you posed, but it was directed to the guy. It was a little different. Something along the lines of, "What's your favorite place to have sex?" As I recall his response was an instant classic. “Ah, that’d be the butt, Bob.” A group of my old rugby buddies and crack up when ever “the funniest things ever heard on TV” topic comes up. Ciao.
It's the actual transcript. From the Urban Legend site...
http://www.snopes.com/radiotv/tv/newlywed.htm
Did you ever see the "Price Is Right" outtake where they call the woman's name and yell "Come on down," she jumps up and her tube top comes down??
I think you're close on this one. I believe it was the Dating Game. The host (Bob?) asked the question you posed,
Bob Ubanks and The Newlywed Game.