According to the NHS Direct website, "sexercise" can lower the risk of heart attacks and helps people live longer.
Endorphins released during orgasm stimulate immune system cells, which also helps target illnesses like cancer, as well as wrinkles, it states.
Sexual health experts said such claims could not be scientifically proven.
"It's good to see the NHS are promoting sexual wellbeing," Dr Melissa Sayer told the Guardian newspaper.
"Yes, there is evidence that sex has benefits for mental wellbeing, but to say there is a link with reduced risk of heart disease and cancer is taking the argument too far."
NHS Direct, however, told the paper the content was "backed by science and clinical evidence" and "isn't just a bit of fun".
'Regular romps'
The advice, published under the headline "Get more than zeds in bed", is one of several sexual health-related articles to be found on the NHS Direct website.
Sex with a little energy and imagination provides a workout worthy of an athlete, the article says. http://news.bbc.co.uk/2/hi/4703166.stm
