Having nearly a dozen orgasms a day does sound like a dream, but a 51-year-old woman with a rare medical condition says the reality is far less pleasurable.

Lorna Harrison can become aroused even while cleaning or food shopping – with driving over a speed bump, one of the things that set it off.

Her condition, known as “persistent genital arousal disorder”, causes a painful throbbing which can only be reduced by an orgasm, or waiting for the arousal to pass.

Lorna told the Daily Star that even thinking about her boyfriend Henry Snowden, 48, can trigger it.

On one occasion the feeling lasted for the entire day – meaning she could not leave her house and was barely able to move around.

She said: “It sounds like a good condition to have but it is uncomfortable, exhausting and happens anywhere at any time.”

The condition is extremely rare, but of the women who suffer from it, there have already been two recorded suicides.

Lorna, who runs a lunch service, is part of a Facebook support group.

She spoke about her experience with the speed bump and said: “I felt a pounding and bulging sensation below.

“It was lucky I didn’t crash as I was losing control of my body.

“When I got to the house I handed over the lunch with my legs crossed, ran to the car and quickly drove home.”

When the feeling returned Lorna went to her GP with concerns.

They gave her an epilepsy treatment which is thought to reduce the length of the attacks and ease nerve pain.

However, Lorna, from South Yorkshire, refused an ultrasound as she worried that it would cause her to orgasm.

She said: “Once in a supermarket, I had to grab shelves for support.

“People looked at me strangely. Another time my friend mentioned my boyfriend. I began panicking.

“I’d already started orgasming and so I ran inside a shop.”

Talking about her partner, she said: “Henry found it funny at first, but now we can’t kiss passionately as it sets me off.

“He counts down from three then says: ‘There she blows!’

“He stays on Wednesdays and Fridays and we have sex then – it’s a relief as the rest of the time it’s torture.

“On one hand I am sick of the condition, but orgasming is amazing; I want to keep it!”