my experience is like tash's. I can have an orgasm just by squeezing my thighs together, and I think I do this in my sleep cos I often wake up at the point of orgasm. My partner says I buck about as if I'm having sex when this happens which is soooo embarrassing! It never happens if I masturbate before going to sleep which I usually do anyway. And if I'm too tired I just put some lanacain cream on my clit before I go to sleep. This numbs my clit so I don't cum.