I read MM Romance, 100% digitally. I occasionally buy a paperback but it's more to stroke than read as I always already have the ebook version. Within MM romance I read every genre except horror, that includes paranormal, shifters, mystery, crime, historical, contemporary and the more erotic genres. But it's all romance, whatever the story the two main characters end up together.
By its very nature this is a genre that owes its life to ereaders, it's easy to hide book covers and titles when no one can see the cover