Making Out, 30 minutes: 230 calories
Foreplay 20 minutes: 87 calories for women, 107 calories for men
Unclasping a bra with both hands: 8 calories
Unclasping a bra with one hand: 18 calories
Unclasping a bra with your mouth: 67 calories
Strip Tease: 60 Calories
Oral Sex: 100 calories
Missionary Position, 10 minutes: 250 calories
Woman on Top, 10 minutes: 300 calories for women, 130 calories for men.
Sex Standing Up: Up to 600 calories for both people.
Masturbation: Up to 150 calories per session.
Orgasm: From 60-100 calories
So in other words, most people on this forum would be burning just the 150 calories in bed.