I've masturbated practically everywhere I could. At home, in the office, in a classroom at university, in the car, in a supermarket toilet. Probably the riskiest place I've masturbated was an enclosed spiral staircase that led down to the now closed market in town. It was one of several ways into the market and was rarely used, and myself and another girl from high school once masturbated next to each other sat on the steps there. A couple of people passed us, but were more annoyed at us blocking the stairs than likely to notice our hands down our skirt fronts.