I was surprised I was mentioned in this thread. Well, in my defense, I'd like to think that these are not sneak shots nor voyeuristic shots since I stand in the middle of the crowd, wait till the subject is near enough, and click.

Everyone in the area pretty much knows I''m shooting people, especially the subjects (I use an 85mm, and I don't crop my shots, so they're quite near). I'm just fortunate enough that I haven't had any violent reactions so far.
On the topic of my shooting 'all girls'... well, being a photographer, I shoot what interests me. And being a heterosexual male, girls interest me. So if you put a beautiful girl in the middle of the crowd, naturally that sparks my interest

But! I don't shoot boobs, or butts, or upskirts, or anything that may be perceived as sexual... I'm not a maniac
Oh, and I do shoot men too.. most just doesn't come out interesting enough for me to post online.