I saw a "factoid" in an in-flight magazine this weekend that claimed that kissing burns up "26 calories a minute". There is No WAY that can be true, right? That's even more than that horrid elliptical trainer at my gym. please, someone tell it's true so i can quit my gym membership!
I cant confirm the figure, but sexual activity does use up an awful lot of energy. Check your heart rate before and during a smooch, if you dont believe it.