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Have you ever wondered how many calories you're burning while you're working up a sweat in the bedroom? Well, it's probably more than you think.

Sex, oral sex and kissing are not only great for your relationship and happiness levels, they are also beneficial to your physical health.

Getting hot between the sheets increases your heart rate and can help you beat the bulge.

Here we reveal how many calories a 10st 7lb woman burns during different sexual encounters.

1. Giving oral sex: 100 calories per half-hour

A woman can burn a whopping 100 calories every half an hour from performing oral sex.

That's the equivalent of walking for 35 minutes or doing 15 hardcore minutes on the rowing machine.

If you want to ramp it up even further, Los Angeles–based sexologist Jaiya Kinzbach, recommends doing push-ups during the act or even trying out some yoga.

*** Perfect penis size revealed ***

"You can do a little yoga," she told Womanday.com. "Try plank position into downward facing dog, and back into plank where you can lower down and do some oral stimulation."

You can blast an extra 71 calories by adding the occasional push-up and a further 35 doing some yoga moves.

THIS IS HOW LONG YOU'D HAVE TO PERFORM ORAL SEX TO BURN OFF THESE TREATS...

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2. Sex: More than 144 calories per half-hour

You'd have to go on a 20 minute jog to burn this many calories, but most people would agree this type of activity is much more fun.

Obviously the longer and more vigorous the session, the more fat you will burn.

There are also some sex positions which are better at burning calories.

Girl On Top is the best for working out your calfs and quads and if you squeeze your legs into your man's sides is will work your core harder.

*** Best sex positions for every penis size ***

This position burns about 207 calories in just 30 minutes. So you'll be sexing your way to a six-pack in no time.

Experts also estimate that women who orgasm during sex burn more calories during lovemaking than those who don't. So make sure he knows what he's doing.

Click here for tips on how to make a woman orgasm and the best sex positions for female pleasure.

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3. Kissing: 68 calories per hour

Smooching alone can help you shed the pounds. In fact, just half an hour of puckering up burns nearly 70 calories.

That might seem like a lot of kissing, but when you're in the throes of love it certainly isn't a chore.

"If the kissing is vigorous and involves some petting, it could be even closer to 90 calories burned in an hour," added Jaiya.

Doing push-ups on top of him and getting a kiss as a reward can also ramp up your calorie-burning potential to around 171 calories in 30 minutes.

So, if you want to lose weight you better gain an active sex life.