Moo -- Episode 214, "Sex Kills"

Clinic patient:
Guy who loves "cows" (i.e. his step-mom)

Wilson: "It's not all about sex, House."
House: "Really? When did that change?"

Believe it or not, the guy lusting after his step-mom is the only one in the episode with any restraint. He knows it's not really right, and he's doing something about it -- albeit a little extreme, looking for the next best thing to chemical castration. But Wilson's wife (and Wilson too, for that matter) gave in to impulse -- killed their marriage. The husband of the woman in the car accident gave in -- killed her. Or maybe she did that to herself, when she gave in. And the main patient gave in to his ex-wife, which almost killed him.

And each in his or her own way is denying it or running away. The clinic patient says he's in love with cows. Wilson and his wife stay in a crappy marriage. The husband doesn't admit to the one night stand and gonorrhea until after the heart transplant. The wife hid pictures in her desk. The dad was tight-lipped for a while about going back to his wife, but really, he's the most forthcoming of the bunch.

So cow guy can fight lust, and the dad can eventually admit when he can't. They'd make a hell of a team.