“Maybe the old traditions of no sex before marriage have merits?”
Of course the old rules had merits, even if those rules were not always observed. (Sadly, I know I did not always keep them, in my misspent youth. And often had cause to regret it - although to be honest, those regrets did not always keep me from breaking the rules when the next temptation presented herself. The spirit is willing, but the flesh...)
Women are the gatekeepers mostly because they are hurt the most. Now, anything goes and peer pressure tells them to have fun. Only there is still human nature and it isn’t really fun and there are regrets and eventual anger. Anger leads to blame, blame leads to accusations of assault.