Sudden bursts of physical activity - such as having sex or jogging - significantly increase the risk of having a heart attack, a new study has found. People are 2.7 times more likely to have a heart attack before or straight after sex Researchers in the US say the chances of cardiac arrest during or immediately after such exertions are particularly high among people who do not get regular exercise. It has long been known physical activity can cause heart problems, but the new study by Dr Issa Dahabreh of Tufts Medical Centre in Boston helps to quantify that risk. My Take: wakuu adui yako mpe sex!!!