I heard about this from a Chinese man. The original meaning of that kanji was "trouble". The old joke was that "if you put three women together, that means trouble!"
sgcdonmai said: The old joke was that "if you put three women together, that means trouble!"
Same character, but in Japanese it's more common in words for transgressive sex, like adultery, rape, incest, bestiality, and necrophilia. Also used for treachery.
...Yeah, the Japanese are a really progressive people. ...Yeah.