Meanwhile just 29 per cent of men said their best sex was with an ex, according to the poll of 1,100 men and women by sex toy retailer Lovehoney. 

This 'grass is greener' sexual syndrome isn't new, said 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," the Daily Mail quoted Cox as saying. 

"They don't regret not choosing them as long-term mates, but they do miss the great sex they had," she added. 

Both sexes also revealed that sex gets better with age with just seven per cent of both women and men naming their first love as their best lover. 

Many agreed 'love' and 'passion' makes the best sex. 

Only 4 per cent of women and 3 per cent of men said their best sex was a one-night stand and just 1 per cent of both sexes named a holiday fling as their best sex. 

But the levels of sexual satisfaction with their current partners differ for men and women. 

Sixty-two per cent of women and 71 per cent of men said their best sex was with their current partner.