I am surprised that more female contributors do not mention the fact that they enjoy masturbating in public toilets, as from my own experience this is quite a common practice.
I have enjoyed masturbating on the toilet since I was a schoolgirl and used to do it during classes after asking permission to leave the room. To this day I often seek out the ladies room if I am in need of relief. It seems an ideal opportunity, with knickers already down, to spread my legs and rub my clitoris, often while I am still peeing.
Because I have very good hearing, I often stay in there for a while afterwards and listen. Quite often I have overheard the unmistakeable sounds of a stifled orgasm from an adjacent cubicle. When this happens I always leave first so that I can get a good look at the woman concerned as she comes out, usually by washing my hands and keeping a surreptitious eye on the mirror. The range is quite wide, I have seen women definitely on the wrong side of 65 emerge after giving themselves a much-needed orgasm. Once a well dressed respectable woman in tweeds emerged, who looked like she might be the leader of the local Women's Institute! I am well into middle age myself, and thought this would have died away by now, but if anything I get hornier as I get older, and need it to do it most days.
I have only once been caught. I was sitting in a toilet in a department store, fingers rubbing frantically as I neared orgasm when all of a sudden the door, which obviously had a faulty lock, opened, and a woman started to walk in. Unless she was blind she couldnt have missed what I was doing, but she just blurted out 'Sorry' and slammed the door. It was far too late to stop myself, and I was already coming as the door closed, but my heart was thumping for more than the usual reasons for quite a while afterwards. Nowadays I double check the lock!
I'd be interested to hear any other similar experiences. I know you are out there girls, I may already have overheard you!