The reason I care is "hentai" is a pretty strong offensive word compared to "ecchi" or "ero". Actually, it's a cursing word level.

How about this? / Although FPS (First Person Shooting?) games are not popular at all in Japan...

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FPS are called "fakku game" in Japanese. (Of course "fakku" = Japanised version of "fxxk") Because someone mistranlated "F" of FPS.
Everyday on the fakku game board of 2ch.net, hard-core fakku game fans are posting,

"Fakku game rules!!"
"Aren't yankees ashamed of fakku games?"
"Fakku game is a part of American culture."

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You should not make fun of them, but you must worry about them, right?