One night my college roommate and I started comiserating about life and our lack of boyfriends at the time, and then my roommate started telling me that she didn't really need a boyfriend, since she could get herself off as often as she liked. She told me that the reason she took so long in the shower every morning was that she was either fingering herself or using the detachable shower head on her clit (!).
She even told me that she had a collection of porn she liked to look at when she masturbated, and she offered to let me borrow them whenever I got the urge to play with myself.
Of course, I took this all in as if she were telling me about her latest tennis game. When I woke up the next morning, I went into the kitchen expecting a very awkward, embarassing encounter with my roommate, but she acted completely normally. After talking to her for a little while, I realized to my GREAT relief that she didn't remember any of her 'masturbation confession' the night before. Whew!
On the other hand, I remembered it very well, and every time my roommate went in the shower, I now knew exactly what was taking her so long-her description had left very little to the imagination, including such details as which finger(s) she liked to use and her favorite position for masturbating with the showerhead (legs spread, face flat against the shower wall, small circles a couple of inches from her clit). I quite often felt a 'tingle' when I thought about her playing with herself in the shower, and more than once I lay on my bed and masturbated while she was (presumably) getting herself off at the same time in the shower.
Even though we were only roommates for that one year and rarely saw or spoke to each other afterwards, I still often think about her whenever I start masturbating in the shower (something I began doing more often after our little talk), and I imagine that somewhere, she might be rubbing her pussy at the same time I am or that we both might be cumming at the same time.
I'm guessing I probably have some latent bi or lesbian feelings (I know many women do), and so this experience has definitely given me a 'safe' outlet for those feelings. Since that time I've also often found myself surfing the web for photos of women masturbating, and it's not uncommon for me to look at those photos when I'm touching myself.