I can't find any evidence in this story that the girl was in fact a prostitute.
Well, then the fact that the narrator characterized his subject based off of a theory, and not a fact, just completely destroys the value of the rest of the story, doesn't it? God, I mean - EVERYBODY, DON'T READ THIS ARTICLE...THE TITLE'S A LITTLE MISLEADING!
I know a Jenny, and she's not a prostitute. She's gotten in bed with some dudes because they had certain substances, but that's different. It's not like, "hey suck my dick now here's your bag, get out," it's "let's smoke and have crazy sex together." I'm not sure if the author earnestly thinks Jenny was a prostitute, either. Maybe the title was for effect? Like, the worst-case-scenario you assume with a young girl hanging with scruffy guys is that she's a prostitute, but this dichotomy ignores Jennys like the one I knew- who weren't exactly turning tricks, but weren't exactly dating 40 year old men because they were mature for their age, either.