This is blowing things far out of proportion. It's like watching Mean Girls and then assuming all of high school is like that for every single student.
I look forward to reading the next generation's history books.
I know stuff like this wasn't blatantly going on in my (fairly affluent) school - everyone knew when a big party occurred. Weed? Absolutely everywhere. Small parties where some sex might have occurred? Sure. Sex within relationships? Yes. Massive 100 person orgies? Nope.
I will lend some credence to the article, based upon a creepy encounter I had at a supermarket. A girl (and her friends) insisted multiple times that we had "hooked up" at a party, and then never spoken. I suppose I resembled this paramour.
I can't stress how odd it is to be accosted by an under-age girl insisting she had sex with you. It was probably the single most awkward experience in my life.
She then said that I must have been drinking, and as such must have forgotten! (I don't drink as a matter of fact - I like my liver just fine, and it's likely I'd have addictive tendencies).
Thankfully, I was able to convince her without involving security or anyone else. It was eye-opening, because of how upset the girl was, and how she believed that the fact I was in college and she was under-age wouldn't be a deterrent for a fling - like I wouldn't practice due diligence before risking jail-time and the sex-offender list.
Still, I think this behavior is localized to certain subcultures, is exaggerated, and is geographically and socioeconomically centralized (notably, the article only mentions LA and NY).