New online tool calculates how many calories your burn during sex

Well, this invention may encourage you to get off the couch and get into the bedroom!

A new online tool called the Sex Calculator tots up the calories you burn during sex.

All you need to do to see just how hard (or not so hard) you need to work out for the rest of the day is put in your gender, body type, position used and length of session and the rest is done for you.

Would you use a sex calculator?