A British woman who underwent surgery to improve her sex life ended up with none — after her vagina mutilated her partner’s penis.

Theresa Bartram, 50, of Brighton, suffered from stress incontinence after giving birth to her only child, sending her confidence in bed plummeting, The Sun newspaper reported.

After going seven years without sex, she underwent an operation to lift her prolapsed bladder with a plastic mesh sling called a transvaginal tape, which stopped her leaking.

The joy of sex resumed for a couple of years, but things went horribly wrong in 2009, when her vagina almost cut off her partner’s manhood.

“It was like it had grown teeth,” she said. “His willy was bright red and spouting blood. There was a big red stain spreading between us on the sheets. After that, he was scared of my lady garden and approached it as if it was a Venus flytrap and he was a bluebottle (fly).”

Bartram thought the mesh inside her caused the man’s gruesome injury, but her doctor kept saying it was working fine.

Six months later, the despondent couple broke up and she grew terrified of having intercourse again.

Bartram went on a diet and began exercising, but a few months later began suffering from serious health problems, including a bloated stomach, severe stomachaches, diarrhea and vomiting.

She was diagnosed with irritable bowel syndrome and given antidepressants. Eventually, she had her gallbladder removed.

Finally, in 2015, she was told the mesh had to be removed urgently because it had breached her vaginal wall and caused an abscess that turned septic.

During the surgery, it was discovered that the mesh — which had been fitted too low — had turned hard.

“It felt like razor-sharp teeth, hence why it had ripped a chunk from my boyfriend’s willy,” she said.

The removal of the mesh left her incontinent again.

“I was told this simple procedure would cure my incontinence and give me more confidence on the bedroom, but it has ruined my life,” said Bartram, whose vagina has been left numb.

“It made my vagina deadly and forced me into a life of celibacy. It could have killed me,” she said. “I’m pleased the mesh is gone but it has left my body and my vagina a total mess. I wear padding all the time and sleep on incontinence sheets.”

Bartram has joined Sling The Mesh, a group that is fighting the controversial medical procedure, which has been suspended in Scotland and is under scrutiny worldwide.