A reason or two explaining why I'd hide my interest in yaoi from my parents

My parents don't know what yaoi is, but my brothers do. They aren't as liberal and open to LGBT related stuff (even if this stuff is generally written by women for a female audience) as compared to other social and cultural fads.
Since many yaoi are explicit porn with plot stories, they'd assume I'm gay because I like this stuff being a guy. I believe that I may be gay and I'm in the closet, so I wouldn't tell my parents who don't know enough about gay people other than common stereotypes that I'm into this stuff. Only my twin brother and a few close friends are aware of my interest in yaoi. My recent exploration of Bara manga, borne out of curiosity and interest is something I'd much rather keep to myself.