She could feel the heat of his body behind her.

He can hear them move and see their body heat.

He had been so close to her she'd felt his body heat.

They were so close that she could feel the heat of his body.

He was so close now that she could feel the heat of his body.

I didn't ever want to miss the heat of his body.

Her body heat alone could almost have kept the small space warm.

It was still warm from the heat of his body.

Hell, he could feel the heat of his own body.

"They lose a great deal of body heat and water through their skin."