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Anna says she's experienced unwanted violent acts during consensual sex - and says some men think this type of violence is "normal".

Over a third of UK women under 40 asked by the ÃÛÑ¿´«Ã½ say they've experienced choking, gagging, slapping or spitting during consensual sex.

The research comes after recent cases have heard defences of "rough sex' - such as that of murdered British backpacker Grace Millane.