Do you know how many times the average Indian man has sex each year, or how many calories a single kiss helps you burn? Read on to learn 10 interesting facts about sex!

1. Burn calories while you're at it!

Do you want to burn your calories in bed? Have vigorous sex for half an hour and burn 150 calories. That way, you can lose two kilos a year if you have sex seven to eight times a month. Increase the frequency and you can lose more weight. But mind you, it has to be vigorous.

Guess how many acts of sexual intercourse take place daily in the world -- approximately 100 million!

You lose calories by just kissing? Yes, it is true -- you lose 26 calories if you kiss for a minute and 260 if you kiss for 10 minutes!

Why wait, overweight and obese people can lose additional weight by this practice. Remember, though, that your regular workouts and diet modifications are the primary way to drop the pounds!

Japanese men are the least interested in sex -- on an average they do it just 36 times in a year, the least amongst men from across the world.

There is an interesting relation between headache and sex -- you may want to try it with your girlfriend or wife! If your partner has a headache, it may be cured by complete, full-fledged orgasmic intercourse.

There is a scientific reason for this -- endorphins are released in the body after sex and they are effective painkillers. Take care not to try it if the pain is intense, though, as it may not work.

Here's another advantage of kissing -- apparently, the extra saliva that is exchanged during the act reduces the decay of teeth by keeping your mouth clean.

Did you know that 54 percent of men and 19 percent of women think about sex everyday, several times a day?

American men have the maximum number of romps in a single year -- that is 124 times on an average, followed by the Greeks, who do it around 117 times.

Do you know the figure for Indian men? It is less than 80 times a year.

How many condoms are used collectively across the world each year? The number is amazingly large -- between 6 and 9 billion! The country with the largest condom production is Thailand -- more than 3 million per year.

And here's one last fact that's sure to surprise you -- which specialist doctor uses a condom daily?

The answer is a radiologist and yes, it's for a different purpose! Condoms are used to protect the ultrasound probe used to scan the prostate gland through the rectum.