In the middle of a baseball diamond, originally wanted to do it on home plate, but the pitcher's mound was much more 'exposed'. It was night time though.
Talking to yourself in the car is crazy. Dirty talking yourself to orgasm? That's fun.
I do, moaning is typical but I find it really hot to talk dirty to myself. Sometimes it feels kind of weird, but no less erotic!
I don't know why, but I do find it a major turn on. I think it has something to do with the authority, for me the police uniform is way more attractive than, say, the mailman.