One in five women who fail to use contraception with a new partner blames drink or drugs, a survey has found.

Some 20 per cent of those aged 18 to 35 have also used the morning-after pill in the last year, and one in 67 men surveyed said they prefer women take the drug so they can avoid wearing a condom.

The poll of more than 3,000 men and women was carried out by The Co-operative Pharmacy.

Mandeep Mudhar, head of NHS development at the company, said: "Our research shows that some women are taking unnecessary risks with their health."