Er, yes and . . . er, no!
It's officially 'genre', rather than 'content' which determines the colour code.
Quote:
"Today, Mills & Boon has lots of genres to choose from. They include: modern romance (virgins, Greek millionaires, yachts, sheikhs, royalty); historical (kissing in costume); medical (A&E kissing); intrigue (spooks kissing); special edition (Jodi Picoult with kissing); 'blaze' (kissing and then some); 'desire two-in-one' (two stories for the price of one). Nocturne - kissing and ghosts - is new for 2008. Each genre is colour-coded, so you pick your happy ending by style not substance. Readers are encouraged to buy an entire month's offerings from each genre in one click on the company's website. As long as it's the right colour for your style of romance, who cares what the clinch on the cover looks like?"
http://www.telegraph....-the-art-of-love.html
However, 'Erotica' is one of the genres listed on the Mills & Boom website, with most of the titles carrying a black band:
http://www.millsandbo....uk/books/erotica.htm
Chris