Whitney Cummings and David Letterman just couldn't get away from the word vagina on 'Late Show' (Weeknights, 11:35PM ET on CBS). She said she was appalled at how filthy his show was and how many times he'd referenced the word, so of course he did it again.

Because Cummings has two shows on competing networks right nows, '2 Broke Girls' on CBS and 'Whitney' on NBC, he decided to ask her which was the better show. "If you had to bet your vagina?" he asked, which set her off in gales of laughter.

So she threw it right back at him when he complimented her scent, but couldn't identify what it was. "You know what?" she said. "It's my vagina."