I watched this on Nickelodeon recently because there was nothing else on. It was the episode where Mark Chang the alien comes to earth to escape being married.

At the end of the episode, Mark is disguised as a new student in Timmy's classroom, and begs the girls not to hug/kiss him, since affection makes his disguise gadget malfunction. I found a direct transcript:

00:10:05 Some kid: The new kid is, like, totally hogging all the action. 00:10:10 Mark (surrounded by lovestruck girls): Do not attempt to kiss me! 00:10:12 Mark: Even the slightest of your earth affection is most lethal! 00:10:17 Girl: The more he rejects us, the dreamier he gets!

It reminded me of the episode of the same show where Timmy wishes he was emotionless. Quote: 

Trixie: Hmmph, I'm ignoring you.   Timmy: ...   Trixie: I said, I'm ignoring you.   Timmy: ...   Trixie: Stop ignoring me ignoring you!    Trixie: He's so unfeeling! That makes him cool.

(Trixie is the token "pretty girl")

The show also makes many references to Cosmo feeling trapped in his marriage. Cosmo satisfies the "idiot husband" trope very well, but his original rendition (before the show started to occupy a half-hour timeslot) was witty, cool, and smooth. I'm thinking the show was pretty RP for a little kid's cartoon.