I was looking up the calories/carbs in a Wendy's Doublestack, and found this. Read the full report (table format) It is too funny:

Sex Calories – Results of Dr. Wieder’s Calories Burned by Sex Study


Following are the results of Dr. Robert S. Wieder’s exhaustive study of the average calories burned during sex activities of various kinds, as published in the American Journal of Exercise Calorimetry in August 2006. Dr. Weider’s research supercedes the energy expenditure figures in the Compendium of Physical Activities, last updated in 1993. As authoritative as the Compendium is, the detail of its data for sex calories per hour is lacking: only three values are given for different levels of exertion for general sexual activities. By comparison, the Compendium lists 12 detailed values for calories burned by forestry activities, including “barking trees.” Dr. Weider’s research has remedied these shortcomings.