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I browsed through some shit at Ikebukoro fall 2016. Taste is really varied but there were four major archetypes, from I could tell:
"Normal" porn usually had the shoujo art style and wasn't very hardcore- the sex scenes weren't graphic at all and show very little penetration directly. Mostly the MC going "ah" with only her head drawn on the page and a lot of blank space. Tons of text about her feelings etc of course.
2 kinds of BL stuff was mixed between shoujo style high school kid/shounen doujins and a rougher style that was typically reserved for large-bodied grown men. There was a lot of sengoku period / office romance stuff I didn't recognize as anything in particular
What I'd call "silver fox" aged men (40-60) just posing / flexing / doing active work. I found this pretty random but hey whatever gets their motors running. Lot of pinup-style posters / collections of these.
I got some real fucking weird looks but would just say "kanojo tame ni" or whatever it is, pretending to have a girlfriend, then picked up some dope naruhina stuff that was popular at the time.