Almost as long as I can remember. It started innocently, leaking a bit in my pants at school (and getting teased for it ... but not by the girls). But later on my neighbor girlfriend had the same affliction and we would often pee together , just for fun.. It was only after that, in my late teens that I started connecting pee with sexual pleasure (but by then, we had moved so I always think what might have happened if I'd still know her).