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GENDER BIAS: A study by Michigan State University found that older men who had sex once a week or more were twice as likely to have cardiovascular episodes five years later than men who were not sexually active.

But women who participated in the study and who said they found sex to be extremely pleasurable or satisfying were found to be at lower risk of hypertension.

The study, surveyed 2,204 people aged 57-85 between 2005-2006, and then again five years later.