“1. Sexual activity affects public health.”
Which is whay there are services like Planned parenthood which provide health advice and protections. But I am pretty certain OP’s ilk would gladly bury Planned Parenthood.
“2. Sexual activity is procreative.”
Says who? Old people have sex too, and there are sexual activities (like masturbation, by the way), which do not result in any possible procreation. Just because OP’s has never progressed beyond missionary in terms of sexual knwoledge does not mean that the rest of the world has remained stuck in old Victorian bullshit.
“3. Our sexual experiences affect our mental health and deeply shape our character.”
True. The same can be said concerning just about anything, like what you watch, what you read, what you listen to, how much religious brainwashing one has been subjected to. Will OP try to regulate those as well?