Lindsay Lohan's recent stint in rehab was made a little more bearable - because she was having sex all the time!

Ex-boyfriend Riley Giles, who was staying at the same centre as the actress, has revealed that the Mean Girls star used sex as a kind of therapy.

"When you orgasm, your endorphins shoot up and it becomes a massive natural high," he told the News of the World.

"If you have an addictive personality like Lindsay you need that to replace the highs you got from taking drugs all the time."

He said that the 21-year-old Lindsay would demand sex all the time - but luckily he claims he was up to the job.

"We once did it four times in a row straight," he insisted to the paper. "We'd go at it for hours. She'd have worn out most guys."

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