Here's a clue into how Andrew Sullivan would answer the question about banning non-egg&sperm procreation:
"If we're all chemicals, why prefer the ones we have by chance rather than those we have by design?"
So, presumably he'd feel the same way about the genes we inherit "by chance" from our parents. But banning steroids is by design, allowing them into the game is remaining open to chance. Making an Amish-style decision to limit technology, such as I'm asking people to do with reproduction, is preferring design to chance. It IS design, of the sport. Doing nothing is chance.