Honestly, I think teachers try as hard as possible to ignore the hook up culture. It’s my impression that teachers are terrified of running into a couple hooking up and having to deal with how awkward and creepy that would be.
I think generally drinking is more sporadic that at most public schools but I don’t think many schools are confronting these issues head on.
If you notice, I am constantly admonishing parents to really hash these issues out with their kids before the kids go to boarding school. Maybe you can ask if there are schools where kids don’t feel pressured to join in the drinking and hooking up if they don’t want to.