Ann L. Lowenstein
You might just be bi, or you might just have been in the moment. Getting off from vigorous, overtly sexual contact with another woman does not automatically mean you’re a lesbian any more than jacking off with one’s buddies, (something men do more frequently than they will generally admit), means a man is gay. The girlfriend is obviously someone with whom you are very comfortable and close. If you were in the same situation with a near-total stranger, do you think you would have reacted the same way?