body temperature
blood heat

The culture had to be maintained at blood heat or it perished.

Which only made Kiron's blood heat as he clenched his fists.

There had been no tender glow in his handsome features for her just now, only the dark urgency of blood heat.

The water was warm; the fatigues trapped a layer at blood heat.

She could feel her own blood heat up and race again.

The memory of that still made her blood heat.

The air was at blood heat and smelled faintly of Kitsune's skin.

He smiled in the way that made her blood heat.

He took her arm and the touch of his hot hand made her own blood heat.