Romance is far less explicit than its reputation, and far less chaste

Ask someone who doesn't read romance what's in a romance novel and you'll get one of two answers, both confident and both wrong. Either it's all smut, or it's all chaste longing and a kiss on the last page.

Actual romance readers know better. It's why heat level is the most requested filter in every romance community going, and why so many people end up keeping a private spreadsheet for it. But everyone knowing the middle is biggest isn't the same as anybody having counted.

Where the whole genre actually sits

So we sorted 64,137 books into four bands by what their descriptions say about the intimacy on the page: closed door, mild, moderate, explicit.

54.8% of the genre sits in the moderate band, which means intimacy does happen on the page, described without much explicitness. Add the mild band and roughly 77% of all romance lives in that comfortable middle.

Both ends are smaller than their reputations. Fully explicit books are 18.1% of the shelf. And the closed-door romance, the one the genre's critics picture as the default, is the rarest thing here at 4.9%, or about one book in twenty.

The average hides a 203-fold gap

That single distribution is also close to useless for picking a book, because subgenre swamps it completely. The number you actually want is in the next chart.

Erotica is 81.1% explicit. Inspirational romance is 0.4% explicit. Those are labels on the same shelf in the same shop, with a factor of roughly 203 sitting between them. Any claim about “how steamy romance is” that doesn't name a subgenre is describing nothing at all.

Dark romance (64% explicit), mafia and reverse harem cluster up at the hot end, which will surprise nobody who reads them. Young adult sits at 3.3% explicit with 39% mild. Also unsurprising, and reassuring in the sense that the method is clearly measuring something real.

The one nobody expects

Historical romance is tamer than contemporary romance, and not by a little: 6.0% explicit against contemporary romance's 20.6%. Nearly a third of historicals (32%) sit in the mild band, which is the highest of any large subgenre outside inspirational and young adult.

The bodice-ripper is the image the whole genre gets tarred with, and it turns out to be one of the least explicit corners of the modern shelf. Some of that is the Regency boom, which runs sweet. Some of it is that historicals do their heat through restraint and longing and the sheer number of layers involved. Either way, if you avoid explicit content and you've been steering clear of historicals, you've been avoiding the wrong section.

The shelf has been warming up

Splitting the same books by when they were published shows a steady drift in one direction.

Explicit share moves from 7.5% in the earliest window to 19.2% in the most recent, while closed-door roughly halves. The middle band barely moves at all. Romance didn't abandon the moderate register. The chaste end thinned out and the explicit end grew around it.

The caveat under that chart is doing a lot of work, though. Read it before you quote the number at anyone.

What a heat label can and cannot tell you

One honest limit first: these bands describe what a book's description says about its intimacy, and not a count of scenes. A book whose blurb and reviews dwell on emotional restraint gets read as restrained. That's usually right, and it's exactly the signal you're working from when you browse a shelf, but it is still a description of a description.

The other limit is that heat level is one number covering things readers care about separately. “Explicit” tells you nothing about whether the content is tender or violent, consensual or not, or whether the book contains the one specific thing you need it not to contain. The corpus keeps content warnings as their own field for exactly that reason. Collapsing all of it into a single pepper rating throws away the information that matters most.

Which is the argument for what we're building: heat as one filter you combine with everything else, rather than a number you hope means what you need it to mean.