Kwai garlic said its survey of 1,752 people suggests 31 percent of Britons have cut a lovemaking session short because they were too tired to continue and 26 percent feel completely exhausted after sex.
The company said 43 percent of respondents above the age of 45 said they are having sex less often than at previous points in their lives.
The poll also indicated one in 20 people are cautious about their lovemaking because they fear triggering a fatal heart attack.
"The results of the survey highlight that maintaining a healthy lifestyle together with taking care of your heart, could help keep your sex life on track. By doing so the 31 percent cutting a session short due to exhaustion, may have more energy to carry on," said Iain Laing, a spokesman for Kwai garlic.
The survey's methodology and margin of error was not given.