Porn written from, by, and for middle-aged women. Technically not considered "pornogropphy" since there aren't pictures (at least on paper.)
The irony of this thing is that most women against visual pornogrophy read their "romance novels" in public, which is something no porn addict would EVER do.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi