I don't really hide or share them, really. No friends to speak of, but an acquaintance of mine from back in my high-school days noticed my
hentai books 2 or so years ago when I last saw him and asked me about them, "It's just porn," I said. He leafed through one of em, nodded, and the subject was never broached again. I'm sure he cares about my personal fetish about as much as I care about his sexual partners- very little if at all.
Family knows, mom and brother, but that would be because they are the only folks who ever come to my apartment and you can't very well ignore the Hyocorou poster framed on my wall or the colorful book spines on a shelf, right? No one seems to care, haha. I would never go out of my way to share anyway. Be it anime, figures, games, music, or even H-stuff, I never saw much of a reason to just bring it up with anyone. If they ask? Sure, but luckily no one bothers and my work relationships are kept work relationships. I have like 2 anime themed t-shirts and a Kuroneko button on my hat, but that's about it so I like to think I'm reasonably subtle.