Extra-marital sex can increase your risk of having a heart attack, a British cardiologist has told a European congress on sexual health.I'm sure the delegates from France were pretty upset - Ivan Graham Jackson, a heart specialist at St Thomas's Hospital in London, found couples in long-term relationships were far less likely to have heart attacks while having sex than those having affairs or one-night stands. And less likely to have a severe cashectomy performed on them afterwards - Ivan "We found that 75 per cent of the cases of sudden death during sexual activity involved people who were taking...