Adolescent sexual maturation ages being reduced by easy access to celebrity sexcapades and the abundance of pornography via electronic media will not be mentioned in history books.
My reasoning was that children get hold of "media" at younger ages these days (Tablets, phones, etc are all being provided to younger and younger children as affordability increases). Therefore are being exposed to "celebrity sex" and "porn" at younger ages. Therefore becoming sexualised younger?
Just look at the 2002 introduction of the 12A BBFC rating. "Ah yes, we'll let your 8 year old kid watch all this drug abuse and suggested rape as long as he's with a **** parent."
I see that isn't the case then.
A major flaw in your argument is that it's only since Victorian times that children were considered 'innocent'. In the middle ages, they might share the beds of their parents, while those parents were having sex, and think nothing of it. Children were exposed to sex at much younger ages than they are now.