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In Japanese culture it's ok for young women to be lesbian for each other "because they're just experimenting".
They play it up a bunch in anime with full blow tit fondling and such, but it does have some basis IRL. So naturally a Japanese idol company doesn't mind doing the same thing with its talents because "as long as its not with a male it's harmless".
The EN talents have adopted this cultural kayfabe because they know their audience eats this shit up, and thus you shouldn't take it seriously.