in the olden days, before hard core anal, double penetration,jizzing, gangbanging, hurting people and all that crap was so readily available to teenagers...
the average teenager got a glance at his dads boob and fanny mags, the awkward convo about the birds and bees, passed a few dirty pics around at school, had a titter, maybe felt a few girls up behind the bike shed etc etc
then he started to date girls...and learned together with them what sex in relationships was all about
fastforward to what is happening more and more today
without any of that more "gentle" buildup...these boys (and girls) are rocketed straight in to the more extreme stuff
the kind of stuff that maybe you don't try until you are in your 20's, 30's, even 40's ...or never want to try at all
but those are informed decisions, made with a partner (hopefully) you can trust, made with maturity and experience
those kinds of practices...bumsex, BDSM etc etc are something you should build up to....not an expectation immediately at the ages of 15/16
it is very sad....and very, very scary