A Sheldon can do your taxes. If you need a root canal, Sheldon's your man. But humpin' and pumpin' is not Sheldon's strong suit. It's the name.
10 seconds sound clip from the When Harry Met Sally... movie soundboard.
You can hear this line at 00:08:24 in the Blu-ray version of the movie.
Quote context
[...]
- Shel. Sheldon? No. No, you did not have great sex with Sheldon.
- Do it to me, Sheldon. You're an animal, Sheldon. Ride me, big Sheldon.
[...]