Susan: I haven't slept with Carter either.
Abby: How long have you guys been going out?
Susan: Couple of months.
Abby: Well, that definitely violates the second date rule.
Susan: What second date rule?
Abby: My friend has this theory, that you should sleep with the guy by the second date, because if the sex isn't good, you shouldn't waste your time with someone you don't have any chemistry with.