Quote from Rachel in The One with the Fertility Test
Monica: It's so weird. How did Joey end up kissing Charlie last night? I thought you'd end up kissing Charlie. Ross: Hey, I thought I'd end up kissing Charlie too. But surprise. Chandler: I missed most of the party. Charlie's a girl, right? Ross: Yeah, she's this new professor in my department that I did not kiss. Rachel: I don't know why Joey had to kiss her. I mean, of all the girls at the party, God! Ross: Why do you care so much? Monica: Yes, Rachel. Why do you care so much? Rachel: Because Ross is the father of my child. You know, and I want him to hook up with lots of women.