Sex secrets of happily married couples revealed

Men admit to cheating more than women (28 per cent vs. 13 per cent), and are more likely than women to say they'd have an affair if there was zero per cent chance they'd get caught (32 per cent vs. 13 per cent).

At the same time, 34 per cent of men say they've checked their wife's phone for evidence of cheating, compared to 20 per cent of women.

Among men, 21 per cent said a celebrity and 20 per cent said a friend's spouse. Among women, 39 per cent said an old flame and 24 per cent said a casual acquaintance.

On average, a majority of people reported being happy with their sex lives, though there was a noticeable gender gap -- 61 per cent of women and 80 per cent of men said they were satisfied.

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