Each author rates their books according to the following system. Evil Plot Bunny does not choose this designation for any title.
One Rainbow — The book is more on the gentle side of language and sensuality, possibly with some sexual tension but no onscreen clenching.
Two Rainbows– Still not spicy. Some onscreen sex maybe, but less explicit language or fade to black. No real violence or hardcore adult situations.
Three Rainbows — A fully realized physical romance onscreen. Some explicit language and adult situations.
Four Rainbows — Begins to venture into more heavy duty sensuality. Some BDSM elements, multiple partners, hard violence or profuse profanity.
Five Rainbows — Like someone dropped a Scotch Bonnet in your Bloody Mary. Blowtorch level sex. BDSM, kink, spanking, lots of explosions.