It sells quite well, to my knowledge. Look at the major erotica and erotic romance publishers. They sort their titles by hetero, M/M, and other subcategories. You'd serve yourself well to seek recommendations or best-sellers in the subgenre you write in, from both trade- and self-published authors. This not only gives you great reading material (yippee!) but also lets you scope the competition.
My own preference, which is most certainly not shared by all, is that I beta read only for people I feel I know pretty well, who've been active and generally pleasant enough for a minimum of several months. Beta reading well is a task of many hours and I won't do it for strangers I don't trust to pass the favor forward and beta read for others.
I do know that among the erotica authors here, there are numerous beta-reading arrangements they've made in private. Somebody's book will come out, and someone else will say on Twitter or Facebook that they read it in developmental stages, or something along those lines. Some people are friends doing favors, some are just in tune with each other as writers, and some are relative strangers who like to help a fellow writer out.
So stick around, join in the boards, both writerly and social, and soon enough you'll probably have much less trouble finding betas for your M/M. Oh, and once you have sufficient posts, it's smart to put up a story or an opening in Share Your Work - Erotica so others can get a feel for your work.
Maryn, who stopped cleaning the basement just to write this, so thank you!
