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The latest study - carried out by scientists at the Karolinska Institute, in Stockholm, Sweden - was based on interviews with 650 people admitted to hospital with their first heart attack.

More than three-quarters were men and half were aged between 45 and 60.

The researchers - whose work appears in the journal Heart --then identified those patients who had had sex around two hours before their attack.

Using medical records they assessed the patients' likelihood of having a heart attack and compared that to symptoms they exhibited one hour after sex.

One potential explanation is that gay men identify with the cultural value placed on an ideal — yet often unattainable — body image.