> As a parent, you cannot control when your child becomes sexually active

It's not entirely out of your control, even though you can't control it entirely.

Also, giving your kid vaccines that are only relevant for sexually active people sends a message, which is that you expect that they may be sexually active. That's not a message that some people want to send to their tweens.

edit: when people downvote this, is it because they think it is untrue, or they just don't like it?