Actually hookup culture resulted in less sex, and married weekly church goers according to the existing data are having the most sex by far.

>higher rates than before (welcome hookup culture)

Got any source to back that up? All surveys I have seen point to younger generations having less sex, fewer relationships, and even just drinking less than their ancestors. Remember, the boomers were the "free love" hippies and then STDs became a serious concern, and we decided we should warn kids about consequences of sex.