According to the Kinsey Institute New Report on Sex, "passionate" kissing burns 6.4 calories per minute. This seems like quite a lot though, and what do we mean by passionate? A figure like 1 calorie...
hum... two answers here. 10 cal for 20 min and 200 calories for 30 min. Think I will put in the effort for that extra 10 min. :). Just kidding- i dont know which is correct.