A study has found that middle aged men who exercise get a boost to their sex drive along with a higher sperm count and stronger erections.
Losing weight reduces the chances of low testosterone levels by up to 50 percent in more mature males.
The results come from a study by Dublin doctors of 900 men with an average age of 54 taking part in a US diabetes prevention programme, Daily Mail reported.
Weight loss can delay or avoid the onset of diabetes among those men who are most susceptible to the disease.
But scientists said the boost to their sex lives could be the added incentive men need to exercise and diet.
The study found levels of testosterone went up in direct proportion to the number of pounds lost and the decrease in waist size.