A new survey has found that more than half of women avoid having sex with their partners because of their extra weight.
In the study, some 52 per cent said their lack of confidence in the shape of their bodies made them reluctant to be intimate, reports the Daily Mail.
Even more blamed tiredness for killing off the prospect of a night of passion.
Experts said the Sex In The Nation poll showed many women were suffering from a combination of unrealistic expectations about their appearance and increasingly busy lives, and warned relationships were inevitably suffering as a result.
The survey of 4,000 people found that 29 per cent of women cited feeling that they looked fat as a reason for avoiding sex, with a further 23 per cent blaming embarrassment about their 'wobbly bits'.
The biggest passion-killer of all was tiredness, a reason 72 per cent of women said they had given their partners, followed by feeling unattractive (34 per cent), illness (33 per cent) and stress (32 per cent).sychosexual specialist Dr Catherine Hood, who lectures at Oxford University, said many women 'feel under pressure to live up to a vision of perfection, which just isn't realistic'.
The survey was commissioned by Fembido, a 'passion pill' made from a blend of herbal ingredients, which claims to boost the female libido.