Just two of the 34 cardiac arrest patients were female, the findings showed.
Research presented at the American Heart Association's Scientific Sessions 2017 contradicts a TV and movie myth that having sex is a common trigger for myocardial infarction or cardiac arrest.
Sudden cardiac arrest occurs when an electrical impulse goes awry and the heart suddenly stops beating, halting blood flow to the brain and other vital organs.
Men with a history of cardiovascular disease may be more at risk of facing sudden cardiac arrest during or soon after sex, a study led by an Indian-origin researcher has revealed.
"I'm a little surprised at the really tiny number", said study senior researcher Dr. Sumeet Chugh, medical director of the Heart Rhythm Center at Cedars-Sinai Medical Center in Los Angeles.
One in 100 cases of cardiac arrest in men was associated with sexual activity, compared with one in 1,000 cases in women.
"Previously we would say the risk is probably low, but we don't know how low", Chugh noted. It usually causes death, if it's not treated within minutes.
About 19 percent of the patients in sex-related cardiac arrest cases survived their ordeal, compared with an average survival rate of around 10 percent nationwide, he said.
New research has shown that people who have a heart attack during sex are more at risk of dying than at any other time. Well, the study concludes that there are rare chances that cardiac arrest can trigger someone during sexual intercourse.
Almost 20 percent of the sex-related sudden cardiac arrest patients survived compared to just 12.9 percent of the non-sexual activity-related patients.
There's one silver lining for people who have a cardiac arrest from sex - they're nearly twice as likely to survive, Chugh said. They have also found that in only one in three cases does the overexerted amore receive what cardiologists term "bystander CPR", but what everyone else would term "the very least a considerate lover could do".
"These findings highlight the importance of continued efforts to educate the public on the importance of bystander CPR for SCA, irrespective of the circumstance", Chugh added.