SarahCarmen, 24, says the Permanent Sexual Arousal Syndrome that she suffers from can cause her to have orgasm at any time of day.
She explained: "Anything can set me off. Even the hairdryers cause funny pulsations through my body.
"As a skin care specialist I have to use tools which vibrate a lot of the time for micro-dermabrasion and they sometimes set me off.
"I find if I'm nervous I'm less likely to get over-excited. So sometimes I try to psyche myself up and worry to control my orgasms.
"Some of my regular customers know my problem. But with new clients it's hard to explain.
"I have been in the middle of a treatment and it's happened and I've had to carry on.
"I was doing a bikini wax and you have to really concentrate and keep your hands very still, and mine go a bit wobbly when I orgasm.
"I had to pretend I had cramp in my foot and just stood there wriggling around on the spot and stifling my moans until it was over."
(Props to C&D for the link.)