Men know more about what happens underneath a hood of their car than they know about their own bodies, a new UK survey suggests.

While nine in ten men said they were confident they could locate a car's oil dipstick, only half were able to identify key parts of their own anatomy,

Researchers said that the latest survey, by the Lloyds pharmacy Online Doctor, also reveals how most men know more about their car's performance than about what can go wrong between the sheets.

The survey finds that most men cannot identify the common causes of erectile dysfunction and symptoms of sexually transmitted infections (STI).

While 90 percent of men said they could find a car's oil dipstick and 89 percent could locate the radiator, only 6 percent can accurately identify all the common causes of erectile dysfunction. A third surveyed wrongly believed that ER was caused by wearing skinny jeans and one out of 10 believed it was caused by too much masturbation, according to the survey of 1,500 men.

The survey also finds that two out of five men could not correctly detect all the main symptoms of sexual infection.

One in 20 men thought dehydration was a common symptom of sexual infection, and one in 10 men thought warm weather and spicy food could cause erectile dysfunction.

Only 52 percent of men surveyed could correctly locate their main sex organs, like parts responsible for creating semen and the area connecting with the testicles.

Shockingly, one in 12 even believed that some of their vital sex organs were found in their ear.

"We all know that two of the most important things for many men are their sex life and their car," Dr Tom Brett, sexual health expert at Lloydspharmacy Online Doctor, said, according to the Daily Mail. "If the car's not performing properly, the British male is usually pretty confident he can get under the bonnet and solve the problem."

"But when it comes to the mechanics of their sex organs, men are clearly less likely to spot a potential problem," Brett said. "It's often down to embarrassment and a 'head in the sand' attitude."

Brett says that men need to have a better understanding of their sexual health so that they can reduce their risk and detect problems before they become more serious.

"Erectile Dysfunction affects thousands of men in the UK and this can be down to a number of different reasons; often the problem is psychological, perhaps arisen from a lack of confidence over one moment of failed performance, or it can be as a result of your health or lifestyle," he said. "And when it comes to STIs often people think that you need to have sex with lots of people to be at risk, however just one brief encounter with someone who has an STI may be enough."