I've tried it and it was okay-ish. But I think I would really enjoy it if a girl did it to me. It's more psychological than physical.
I'm one of these girls. But actually it's even better when i'm masturbating and i'm getting a little help from my bf - meaning his fingers in my ass
every once and a while...everytime i masturbate in the shower, which is rare. it does feel good, but i am definalty not gay. most guys think that they are gay for this, but they are not. there most likley even more comfortably with there orientation for trying it.
My boyfriend does it. Not so much in sex play, but he used to do it when he masturbated. I don't personally like it unless I'm feeling really naughty and want to do something taboo.