Currently, the highest sales figures are still with traditionally printed massmarket paperback books and in erotic romance, this is dominated by straight M/F stories, although its dominance it weakening every day.
But in eBooks, through publishers like Ellora's Cave, Loose Id, Samhain, Siren/Bookstrand, Breathless Press, Ravenous Romance, Liquid Silver Publishing, Phaze and many many more... the top sellers are M/M (not to be confused with gay fiction) and M/F/M menage (which is different than F/M/M)... Straight M/F still does well, but F/F does not (which I thought was strange, but the statistics prove its true)... Additionally, they've noticed that their readers are 75% or more female.
So what's going on? Why is M/M and M/F/M surging up through the ranks? Any theories?
