Pauline Potter became the world's heaviest living woman last year, weighing in at a whopping 643 pounds. Now, Potter has her sights set on losing weight, and she's turned to marathon sex sessions to help shed the pounds.

In an interview with the UK's Closermagazine, Potter described how her reignited sex life with ex-husband Alex has helped her lose 98 pounds.

“I can’t move much in bed, but I burn 500 calories a session –- it’s great exercise just jiggling around," Potter told Closer. Potter, who had been consuming 10,000 calories a day, hopes to reach her goal weight of 532 pounds with the help of Alex. The two have sex up to seven times each day.

She makes sure to have some fun, too.

“We love foreplay and massages and, as well as full sex, I pleasure Alex, too," she told the magazine. "My bed is strengthened and, although I can’t buy sexy lingerie, I drape a nice sheet over me.”

After meeting online in 2002, the couple married in 2005 and, when Potter failed to bond with Alex's son, the two split up three years later. The break-up triggered Potter's weight gain. She began consuming copious amounts of high-calorie foods and packed on the pounds.