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In Maison Ikkoku, the title of episode 60 is "見ちゃった!響子{きょうこ}と三鷹{みたか}がいきなりB?!", which is translated to "Caught in the Act! Kyoko and Mitaka-Hot and Heavy!"
My question is, what is "B"? I've literally never heard it before @.@. I know "H" and "BL", but I've never heard just "B" to have any meaning ...