Robin doesn't know what to say. It was funny. "I laughed. He laughed, and it just kind of happened." Robin totally needs a Karen in the next room at all times. As the gang chuckles over the events, Marshall blurts out: "I call SLUT!" to everyone's horror. "I'm sorry Robin, but you hooking up with this guy makes it seem like the only thing standing between you and sex is clothes." Robin claims she didn't just sleep with Mitch because he was naked, but she can't form a coherent or cohesive sentence as she tries to give another reason. It all amounts to a "connection... of... specialness. Of, uh... specialness and feelings." Marshall calls B.S. He says she only slept with Mitch because he was naked and, "I do not approve. There is only one reason to sleep with somebody, and that is love." This is a lovely bit of continuity for Marshall, who once bragged that his list of every girl he's ever slept with is his marriage license. Everyone laughs at him, even Lily, but he mocks them right back, "Yeah, Marshall's a big girl, because he believes in true love, and just finished reading The Notebook, because the secretaries bullied him into joining Oprah's Book Club. Fine, but you know I'm right!" Lily reminds him that she loves him, but argues that there are a lot of reasons to sleep with someone. When he tells her to name one, she reveals that that time they had sex at 3:00 in the morning was because she couldn't sleep because she was scared of a clown-shaped shadow. Marshall is angry she befouled their marriage bed, but admits that that's one reason, and Lily says she can name 50. Ted, Robin and Barney help her, and the list begins with the following:

1. Because you can't sleep. [Lily]
2. Makeup sex. [Lily]
3. Breakup sex. [Lily]
4. Your friend just told you about a new position. [Lily, although Barney says, "You're welcome."]
5. Revenge. [Barney]
6. Rebound. [Barney]
7. Paratrooping (hooking up so you have a place to stay when out of town) [Barney], a.k.a. "banging for roof." [Robin]
8. Nothing good on television. [Lily]
9. Hotel room sex. [Ted]
10. Curiosity. ("What's it like to have sex with a really tall girl?") [Barney]