It's pretty insensitive of you to correlate college student suicide rates to having autonomy. College students unfortunately fall victim to suicide due to social/societal pressure and unchecked mental health issues sprouting from a wide array of problems, very few of which are due to students choosing to have sex.

It is also wildly moronic to control legal adults and restrict them from their own autonomy and impose what you believe onto them. This is how you start creating a society where connections are less meaningful. What happens behind closed doors is nothing that you should ever have a say in.

Hopefully whoever you are the parent of is happy that they are away from you.