50-100 calories an hour. Or about 4 calories in 3 minutes.
"We were cuddling, sweetie."
"Yes, but why was daddy on top of you? And then you were on top of daddy?"
"Well, we were hugging. Just hugging and cuddling. Um...how long were you standing there anyway?"
"You were exercising mommy! Were you exercising with daddy?"
"That's right Thalia, we were exercising. That's exactly right."