Yes sex after marriage still happens. And I've heard more people saying they have begun abstinence...til marriage and they seem sincere in their intentions.
I think society has maxed out on being carefree and how far we can go, and now we've come full circle and are getting back to values and morals, many for individual and various reasons. Of course this is NOT everyone. Morals are individually defined nowadays and so the decision to "be free" or otherwise, will come through education or/and inward convictions.
There are several Christian and non-religious groups that are promoting abstinence before marriage that can be joined via website.