It is the collapse of social norms which controlled male and female sexuality I have an article on the topic
Coming out next Friday which also talks about Hugh Hefner and Marilyn Monroe
I would say as well that a woman who is 18, 21 or 24 years old is a lot younger in the head then a woman born 100 years ago and especially 300 years ago
Our childhoods now last until the 20s and children even if it is just mentally should not be in relationships or engaged in sexual activity
I would have the failure of parenting contributed as well and leaving too much to the education system to raise children and then turn them into young men and women