[Lily tries to talk to Marshall about him not being fertile]
Lily: Okay, now you're being ridiculous. An hour ago, you didn't even think there was a problem.
Marshall: I was just putting on a brave face. Think about it - we've had unprotected sex 203 times in the past four months. [high-fives Lily] Obviously, I'm the problem.
Barney: Problem? You can't get a girl pregnant -- that's the dream! I'd give my first-born to not be able to have children.

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