You have never witnessed the "forbidden fruit" syndrome? It's very common when kids go to college. They get their first taste of freedom and then go crazy in overdoing all manner of vices. Kids whose parents do not allow them to consume alcohol, for instance, are generally the most likely to be found throwing up every night / morning in the dorms. For those who have had a little here and there, well, alcohol has less of an allure for them.
I will not list names, but I would say that the majority of Traditional Catholic children in the two chapels near me have gone off the deep end after becoming independent. Several marriages in the Novus Ordo, much sinful cohabitation (sometimes with the fiction of a civil marriage). Many of these are now divorced. Quite a few have ceased practicing the Faith altogether. And, from what I have seen, the more strict their parents were when they were growing up, the farther they strayed. Young men and women who are ultimately called to the married state often become frustrated with the lack of suitable prospects at their relatively-small chapel populations. So, often, the second they find someone to whom they are attracted, they go for it. Very, very common. I think it's healthy for youngsters to mingle in controlled public settings (no exclusive dating) with members of the opposite sex. That way they can develop a sense for the type of person they would be compatible with, and the allure/mystique of the opposite sex quickly wears thin.