Sexomnia clip

The official YouTube channel has lots of clips. This one most popular with 18M views.

https://youtu.be/WR7teEjB_YU (4m)

A woman comes to the clinic showing symptoms of pregnancy but when she tells House that she's not been sexually active in over a year, he discovers a startling reason for her health problems!

Season 1 Episode 17 - Role Model

Second place: Wilson on Speed: https://www.youtube.com/watch?v=ObWzvqknX2A