This is the internet. All sorts of twisted things live here. Maybe sending dick pics feeds into a fetish for some. Chances are a lot of them are just trolls being assholes in a way that often gets what they want, a reaction. Either way, this falls into the same category as other types of "free speech" in my opinion: you can be into whatever you like (fetishes, religion, politics, selling stuff, whatever), but your right to put it out there ends at your neighbor's door. If you get in my face with something I didn't ask for, you forfeit your right to expect respectful treatment from me. My default attitude is that everyone gets respect until they demonstrate that they don't deserve it. This counts as a demonstration of that.
As to the original question: did you honestly think a large percentage of guys have done it? Seriously, I get that it happens and that when your profession involves being a sexy woman in public, you're going to get more than your share of it (no, you are not asking for it, but guys who do think that way will come out of the woodwork), but this is not a page out of the "average guy's handbook." Sometimes I get kind of frustrated with all the talk about bad things guys do. Some guys do bad things, but most guys are not any more bad than most women are. The problem, I think, is that the loudest, most attention-demanding people also tend to be the least reasonable, and bad behavior evokes more public reaction than good behavior. This tends to give the impression that an obnoxious few are actually representative of many more people than they really are.
