Ted asks the dermatologist removing his butterfly tattoo on a date.  The gang tries to talk Ted out of going out with someone he's going to see regularly (aka The Platinum Rule).  Everyone shares their horror stories: Robin dating a co-worker, Barney dating Wendy the waitress, and Marshall and Lily double-dating with their neighbors.  Ted ends up going for it and getting turned down anyway when she says it's unethical for her to date patients.

How I Met Your Mother
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How I Met Your Mother Season 3 Episode 11 Quotes

Robin: We can split a cab to work together, we always have a standing lunch date, and last night, at the hockey game, Curt got us into the locker room and I met Mason Raymond. [gang looks clueless] Left wing for the Vancouver Canucks!
Barney: What's the opposite of name-dropping?

Ted [showing his tramp-stamp]: Say goodbye, kids, 'cause it won't be around much longer.
Lily: Oh, but Ted, if you get rid of the butterfly how's everyone gonna know you're a stripper from Reno with daddy issues?