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A 91-year-old woman is believed to have suffocated during a sex game with a 49-year-old neighbour.

The OAP was found on her bed naked from her waist down next to a sex toy in Aveiro, 50 miles south of Porto, Portugal.

A married dad-of-two living next door has been arrested after DNA analysis of semen recovered from the scene.

He was released on bail after going before a judge who was told autopsy results showed she died from asphyxia thought to have taken place during a sex game that spiralled out of control.

The death is believed to be the result of a tragic accident, Portuguese newspaper Jornal de Noticias reported.

The extensive genital injuries appear to have been caused by the object found near the body.

The neighbour who found her Ana Martins, said: "She was lying in the bed, naked from the waist down and with a vibrator.

"I noticed only two small bruises on her face, but there was blood on the sheets and a picture of her husband resting on her chest."

The victim, who was a widow of a sailor, was "very active" and "liked to make jokes with men" added Ms Martins.

Another neighbour described the woman, who lived alone, as being “very active” despite her age and said the man often went round her house to do odd jobs.

Police say there was no sign of a forced entry and nothing had been taken from the house.