Re: The Big Bang Theory
They went to the sperm bank in the actual pilot.
If I remember right they go to the sperm bank in both pilots. In the unaired one Sheldon has no problem donating and is made fun of by Leonard for bringing his own wanking material (big butt fetish magazines). In the aired one the now asexual Sheldon refuses to donate.
"I calculated the odds of this succeeding versus the odds I was doing something incredibly stupid, and I went ahead anyway." - Crow T. Robot, Mystery Science Theater 3000: The Movie