The former model and DJ told The Mirror she'll never kiss and tell, despite always being asked what sex was like with the Hollywood star.
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George Clooney and Lisa Snowdon during the 'Ocean's Twelve' Los Angeles Premiere
"People actually ask me what he was like in bed, usually after a few drinks have made them brave.
"They are like, 'Seriously, though, how was it? What was he like?' I never tell," she said.
The Capital FM presenter also said she knows she'll always be known as 'George's ex'.
"I sometimes think it will be written on my tombstone - 'George Clooney once dated Lisa Snowdon'," she joked.
Clooney is currently dating ex-WWE wrestler Stacy Keibler.
The couple have been together for almost two years and friends reportedly believe their romance has lasted this long because they don't live together.
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Clooney and Stacy
A source told Life and Style magazine: "She still has her own place in LA. She thinks it's best not to give it up completely and George agrees. She never goes there. She practically lives at George's - that's definitely a sign he's committing 100 per cent to her."
52-year-old Clooney was previously dating Italian model Elisabetta Canalis.
George Clooney's Ladies
Talia Balsam(01 of08)
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So far the one and only Mrs George ClooneyWas married to the ever-since singleton for four years from 1989 to 1993Now married to actor John Slattery, with whom she co-stars in Mad Men, with one child
Kelly Preston(02 of08)
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Had a short-lived fling with George Clooney before her marriage to John TravoltaLeft an indelible mark on Clooney's life, however, with a present to him - his pet pig, Max, who, before he died, seemed to have a more secure place in Clooney's affections than any woman.
Lisa Snowdon(03 of08)
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Lisa Snowdon proved that some girls' dreams do come true, when she was whisked off her feet by George Clooney, back in 2000, after meeting him on the set of a Martini commercial.The pair dated on and off for five years, and have remained friends.Snowdon now co-presents a radio breakfast show with Johnny Vaughan, and remains single.
Mariella Frostrup(04 of08)
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Rumours abound that George Clooney and Mariella Frostrup became more than friends after they struck up a rapport at Cannes Film Festival over a decade ago. Nonetheless, both have denied being any more than good friends, and Clooney is a devoted guardian to Frostrup's two children with her human rights lawyer husband, Jason McCue.The family has often holidayed with Clooney at his villa in Lake Como, Italy.
(05 of08)
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Renee Zellwegger is another of George Clooney's longtime female friends, who is rumoured to have dated him back around 2001. The pair co-starred in Leatherheads in 2008, by which time Renee had married, and split from, Kenny Chesney. George had made no such trip down the altar.
Sarah Larson(06 of08)
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It seemed that George Clooney had finally settled down with former waitress Sarah Larson a few years ago - the pair survived a motorbike crash in the early days of their courtship, and Larson accompanied Clooney to the UN when he campaigned for Darfur. Their union was unceremoniously called off in 2008.
Elisabetta Canalis(07 of08)
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Once again, it looked like wedding bells were ringing for George Clooney when he took up with Italian TV presenter Elisabetta Canalis, whisking her off to his Lake Como villa on the back of his motorbike - what's not to like? Two years later and, despite her Mediterranean charms being splashed over the press in the skimpiest of bikinis, she made the fatal mistake of mentioning that she'd like to get married one day. Splash, into Lake Como, went her dream of settling down with the eternal bachelor, and off she went to lick her wounds with her Italian family.
Stacy Keibler(08 of08)
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Exit Elisabetta, enter Stacy - with almost unseemly haste, it seems Clooney has a new lady on his arm, this time former wrestler and model Stacy Keibler, whom it appears George Clooney has been friends with for years.Keibler was flown to - guess where - Lake Como - recently, where she tweeted: "I'm in heaven".Despite Clooney's protestations that he never wants to settle down, he may do well to keep on the right side of Stacy. Bearing in mind her former profession, she may not take any shoddy treatment lying down.