Want to know how many calories you burn during sex? Take this test based on your favourite position to find out
You can create a whole fitness regime based on the positions and do a full body workout without having to go to the gym
IF you burn enough calories under the bed sheets then you might as well ditch your gym membership.
A new "sex calculator" created by online doctor and pharmacy service Dr Felix works out exactly how many calories you burn during your steamy session with your other half.
According to the site, having half an hour of heated sex is the same as going for a four-mile run.
It states: "Sex is an area often overlooked in terms of our workout regime, but with different positions you can burn calories, tone muscles and have a whole lot of x-rated fun in the process."
The calculator promises to show how many calories you've burnt and the effects of your sex workout by showing you which muscles you are working out such as arms, glutes and abs.
It even shows you how to take it up to the next level to help you burn more calories and tone more muscles.
How it works
Step 1. Select the genders of you and your partner.
Step 2. Enter your weights or use the weight slider for an estimate.
Step 3. Select your sex positions and move the sliders to show their duration.
Step 4. Calculate!
For example, an 11st man and his 9st female partner, doing an hour of missionary position sex, and another hour in the doggy style position would burn 462 calories for men.
This is equivalent to three pints of lager or one hamburger which would take just over two hours of cycling or a playing a full match of football to burn it off.