So, in a place where the age of sexual consent is 16, a certain number of teens over 18 having sex with ones under that is supposed to be "shocking"? For some bizarre reason, bad faith actors insist on phrasing it like that, then trying to pretend it's "creepy old men". It's also not the porn*.
* https://reason.com/2015/07/23/despite-all-the-panic-millennial-teens-h/
There is also an argument that some portion are "older", but again, they may have done it decades ago. There is no "when".
Saying they're more likely to be "perverts" doesn't change this and isn't relevant.
Basically, he's trying to play up the number of "predators".
Anyway, here's another one "they know someone who has done the same thing". This revelation apparently completely changes things... Except it doesn't...
As the data here (different data set) shows, 50% of teens in the late 80s, and 40% in 2013 had sex with each other, therefore the probability that someone "knows" someone who has done this approaches 100%.
If there's a correlation between that, and "perversity", or whatever, it might be they're more willing to talk about their private sex lives with each other. Who knows.
Still, it's easy to think of non-conspiratorial explanations.
It's also almost certainly not a representative sample. In fact, there's no information at all on the sampling. No idea where it came from or how it was collected.