Impossible to know. I don't care what qz.com claims. Usually this stuff is done discretely so only 2 people really know what happened. There is also the fuzzy line between trying to laid and outright harassment.
Also, the default view should be to assume a person under 30 does not want to have a casual fling with a 50 year old, overweight executive.
This happens way more than you imagine. I've known several cases myself.
Causal hookups are about physical attraction, for both men and women. And if genders were reversed, and this was an overweight, 50 year old woman trying to hookup with young, good looking guys, the men here would think to themselves, "eww, no."
That is exactly what these young women thought (and said as much in the article)!
there isn't necessarily a line. if you keep "trying to get laid" after being told someone wasn't interested, you're doing both.
M: Can I have sex with you?
F: no you cannot have sex with me.