Honestly, I wouldn't. What if, God forbid, there were some complications during delivery and she got shoved out of the room? That to me would be horribly frightening as a child. If she's fast, there's no guarantee that seeing a birth would necessarily scare her out of having sex. If that is your concern, I would suggest letting her watch a video tape of a live birth, or letting her go to the maternity tour class at the hospital so she can see the movie. (Check with your hospital to see if they have a movie they show, and if you can bring your child..) But that's just me.