To add to discussion - in exercise studies with equal weight and pace, the burn is almost exactly the same between men and women - showing it takes same amount of energy to move mass from gravity.
And that is regardless of muscle mass differences, gender, age, or fitness level. Those things will determine the HR needed to accomplish that effort, not the actual calorie burn. Formula's for range of pace is better than HRM estimates.
http://www.ncbi.nlm.nih.gov/pubmed/15570150
But several comments were about resting metabolism, and men have the bigger metabolically active organs since average size is bigger. Muscle burn resting is minor consideration.
That 5-10% less BMR is actually with equal LBM measurements, and the most accurate part was the difference in sedentary TDEE was 5-10% less for women than men.
www.ncbi.nlm.nih.gov/pubmed/1522233
But usually men weigh more than women, and weight is big consideration for calorie burn for anything that requires moving.
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