This says it well

I have heard the analogy, I think by Scott Hahn, but Philip Blosser expands it quite well.
He quotes Professor Janet Smith's ("Contraception: Why Not?"), here

"Doctor, you know, I want to get the girls. I want the girls," he says. "And the way to get the girls is to have big muscles. So, would you please give me some steroids." Any doctor worth his salt will say, "Son, get out of here. Join the wrestling team. Lift weights. Do push-ups. I'm not going to give you steroids. They're bad for you. They could ruin you. I'm not giving you steroids." But, a fifteen year old girl trots into a doctor's office and says, "Doctor, I want to have sexual intercourse with my boyfriend or boyfriends."

What do you think would be the doc's answer?