Most of the heat ratings are very similar across the book world. Here is the detail of how Uncaged defines the heat categories – these are mostly seen in the Feature Author sections as the Review section has it’s own detailed warning box.

1 Flame – No sexual content. Most Young Adults fall into this category, and is considered a “clean read.” Sexual activity is behind closed doors.

2 Flames – Some sexual activity, but not graphically described, most is left up to the imagination.

3 Flames – Sexual content, more than one scene – and can be detailed. A few sex scenes are common.

4 Flames – A lot of sexual content, the language can be harsher and scenes are well described.

5 Flames – Flat out erotica, BDSM or multiple partners, many sex scenes, graphically explained.