In the most open minded society (USA) only 7% of the youngest have genital activity. That’s less than one in ten individuals. That is way too short if you take into account the amount of erotism in every American movie or mass media.
And to that, you must add the fact that such activity only adds uncertainty to the relationship, according to the article published by the economist.
It is to say that it’s not that we are in a “young-erotic” society but rather we are in a very un-authentic social environment driven by perceptions of what is good without a criteria that makes the best of every single space of human life.