Oh yeah, it's totally an anecdotal thing - sorry if the phrasing led you to think otherwise. But for real, living in Chicago, I can't think of a single female friend that hasn't told me about a guy masturbating next to/across from them on the train, or sidling up against them during the afternoon rush with his erection pushed up against them, or waiting until they're making eye contact, then showing them his penis from behind a newspaper or something.
And that's not counting the times I've seen it myself. A couple months ago, this guy walked through an entire car of people telling random girls that he bets they "suck the dick real good" before people had enough of it and collectively yelled at him to get lost.
This is a near-constant thing in large cities with big public transit infrastructure, and women get it bad. That's what I'm trying to communicate.