I talk to her about stuff I wouldn't dream of telling my male friends. She's beautiful but I have no interest in sleeping with her whatsoever.
No you are a man poodle, friend-zoned, whatever. As far as the girl is concerned the most you would ever be useful for is a good cuddle and chick flick night. The girls definitely aren't aware of what is going on that is for sure. All the sexual tension is stuffed away on part of the guy.
You can hang out with your girlfriends friends, or you can joke around with girls who are acquaintances etc, but any kind of girl-guy friendship is generally man poodle / friend zone / she thinks you are gay. You even admit yourself that you put your penis in a jar already just to prove what a nice guy you are lol.
I understand already having a good girlfriend and so everything else is a non-issue but then you come across the problem of how you act. Do you act like a man poodle where you get toted around to various girl adventures or do you act manly/flirty, but if you do the second it's not really a friendship. I'm not really a fan of acting girly around girls, as even they will have no idea where to place you. All they are wondering about is if you are gay, why you are there, or they are just naive. They will figure out you have a girlfriend then they will REALLY be wondering why you are there. I personally can't stand acting girly, so I don't really hangout with girls as friends.