Around 38 per cent of girls admitted that their current partner just doesn't live up to their old flame in bed – so they regularly fantasise about their ex during sex.
Just 29 per cent of men pined for a past lover in the bedroom.
"The 'grass is greener' sexual syndrome isn't new," says sex expert, Tracey Cox. "Women don't tend to marry the guy they had great sex with. They marry for more sensible attributes – like whether he'll be loyal and a good father.
"I get lots of emails from women saying they love their husbands but fantasise about sex with their exes. They don't regret not choosing them as long-term mates, but they do miss the great sex they had."
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