Taking a woman's virginity has always been coveted as an achievement for men, but with modern women actually getting to choose when they have sex, the best chance a man has to get with a virgin relies on him being the very first mistake a girl makes. That coveting and sexual value is one of the many disturbing reasons girls are pursued at such a young age.
To see it in action, you don't even need to pull up studies or do heavy research or even go to a porn site. Just type "school girl" into Google. Not sexy school girl. Just "school girl," as in "a girl who is in school." I don't even need to tell you what you're going to get. Hell, most of you won't type that in, because you don't want the results on your search history. You didn't ask it for a bunch of half-naked women, but like an insane tweet from Donald Trump at 4 a.m., it's just inevitably there. The top web searches that come up for me are all for sexy schoolgirl costumes. The only outlier is a link to the "schoolgirl" hashtag on Instagram, which populates the same collage of young girls, porn, and anime porn. You know ... classic school activities.
Are these portrayals meant to be graduate students of consenting age? Hell no, they're not. They're wearing a parody of the uniforms once worn by girls in religious middle and high schools. A uniform so highly sexualized that most religious institutions now require students to wear khaki pants. Try to make those sexy, creeps.