When Al Franken was on tour with the USO, one of his jokes involved pointing to the cheerleaders on stage and saying he would think of them while having sex with his wife.

"I don't know how you guys do it for nine months," Franken in a 2004 article quoted himself as saying, "I've been over here a week, and the first thing I'm going to do when I get home is have sex with my wife — while thinking about the cheerleaders. Not so different from you guys, except I won't be alone."

There's a long tradition of sexualized humor and half-naked women in USO sets, and I'm a bit of a prude, but that one strikes me as a little extra gross: saying in front of much younger women that you will be thinking of them while having sex.