I wrote some post on yaoi before and explained what BL has to offer here. I’ll just restate some of the points briefly.
One of the reasons is that finding a woman character to my taste and understanding is hard. I won’t go into detail, because I also pointed out what I am looking for in a woman character here, overall I think mangaka may not be able to break the habit of conventional understanding or would like to create something conventional, sadly, I don’t enjoy reading those kinds of stories.
Having a male character may be more freeing for mangaka because men are capable of doing anything and being anyone. Thus, there is more variety and fully developed characters, generally.
Another reason that I stated in my yaoi-related article is that centering a homosexual/poly-amorous relationship also helps to break the wall of normativity and create an environment for mangaka to run wild in the field of diverse themes which we ‘normally wouldn’t see in manga’ like BDSM, kink, one night stands, polyamory etc.
It is a given that manga is a huge market and I’m sure there are works I haven’t read before that have stories/characters to negate what I generalize here, this is just my experience up until now.
(⁎ ✪͡ ◡͐✪͡ ⁎)ﾉ”
Header image : Onegai Kuroko sensei! by inumog. Kuroko no Basuke doujin, pairing is Kuroko x Aomine. No trigger warning.
Second image : Kimi to Mita Houkoboshi o Sagashite by Mitsuki Emi, original art.