It should be noted that the reason why BL started as a women's demographic is because it's an offshoot from shoujo romance manga, with the assumption that only girls wanted to read romance stories, and that boys only wanted action and fanservice. I think comparing it to lesbian porn is unfair if only for the fact that BL as a genre isn't really intended purely for titillation (though even if it was, I don't think there's necessarily anything wrong with that as long as real gay men aren't objectified and are treated respectfully).

Thankfully, there are more and more male and nonbinary BL authors nowadays, and demographics are merging with sub-genres like gachimuchi BL, or series with gay romantic couples in general magazines marketed towards boys and men. There are also many geicomi artists that sometimes write for BL and BL-leaning magazines, such as Tsukasa Matsuzaki (who unfortunately passed away due to COVID), and Gengoroh Tagame.