London: According to a survey more than half of women avoid having sex with their partners because of their extra pounds.

The study reveals near about 52 percent women feel shy because of their body shape which make them reluctant to be intimate.

Experts said the 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 percent of women cited feeling that they avoid sex as they feel shy being overweight with a further 23 percent blaming embarrassment about their 'wobbly bits'.

The biggest passion-killer of all was tiredness, a reason 72 percent of women said they had given their partners, followed by feeling unattractive (34 percent), illness (33 percent) and stress (32 percent).

Psychosexual 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.