It's all phooey.
My boys are 18 (not JW oc). I think they have maybe two friends who are in relationships with school sweethearts, but otherwise one is not interested and too busy swotting for exams prior to uni (he's had provisional offers from several Russell group unis to do maths and IT). The other is joining the army after 6th form exams & would like a girlfriend. He met one girl, had a few dates but she lived too far away to go "steady" which is what he wants. The other potential he liked moved back to china after a year at college here.
They and their friends are far from 'sex mad' and very sensible all around. In my opinion far more so than my generation!!!