Over a third of the Swedish population (37 percent) listened to audiobooks last year, a marked increase over just the 20 percent who did the same in 2016, national broadcaster SVT reported.
While audiobook streaming services have reported a spike in listenership in all categories, there are some spicier types that lead the way.
"Amongst the listening public, genres such as romance, 'feel-good' novels and eroticism are growing. We are thus seeing increased demand from listeners as well as an increase in the number of publishers who are putting out these types of books", Anna Riklund, content manager at audiobook streaming service Bookbeat, told SVT.
Swedes' growing interest in naughty novels has led several publishers to start branches entirely devoted to erotic literature. For instance, the publishing house Hoi Förlag has started an imprint called Lusthuset, specialising in erotic literature.
Audiobook streaming service Storytel has reported increased interest in erotic and romance novels, particularly among female listeners. According to the service, listener numbers peak around Valentine's Day and during the hot summer months.
"Embracing romance is easy. It is happy-ending and feed-good type of reading. As a pastime, it works very well, providing a little escape from reality", Anna Riklund mused.
According to Hoi Förlag marketing director Susanne Ahlenius, who prides herself in being the author of Sweden's first erotic detective novel, the audiobook format is perfect for the fans of the genre.
"It's anonymous. You don't have to sit with a paperback that shows what you are reading. No one knows what you're listening to," she told SVT.
According to her, the publishers started to dress up the book covers in order to make them more appealing to other target groups. By her own admission, books written "in a very explicit manner with lots of sex" are the most popular.
"People like it hot", she concluded.