A few years ago, I was in a big box store and overheard a young (~10y/o) child and his mother picking out a new video game. The kid excitedly picked up a box and asked his mom if he could get that one. She checked out the cover, then started reading the rating. "Rated 'mature' for sexual content? No way!" "Aw, man! Ok, how about this one?" "Rated 'mature' for extreme graphic violence? Well... ok."
That's because violence is not relateable. When people see violence, they don't think, "Hey, I want to do that!" But when they see sex, they do.
Same with pictures of people sky-diving, drinking, racing in fast cars, etc.
All of these things can be pretty dangerous, in fact far more dangerous than having sex. Better start the bans!