It’s not just Japan, and it doesn’t just apply to women. K pop has the same situation, and boy bands are no exception.
Although modern media allows for much less privacy, this idea is far from new. Back when The Beatles were a fresh, new band in the early 1960s, John Lennon had to hide his first marriage from the public. Long before Yoko Ono, there was Cynthia Lennon. John was pressured to hide his relationship for the same reasons that K pop and J pop idols do - in order to create the illusion of “attainability” among fans.
Times have changed in the west, where celebrity couples have found greater public acceptance. I’m not well-versed in Japanese and Korean celebrity cultures, so I’m not sure why this prohibition on dating/marriage still occurs there. All I know is, this situation is not unique.
Republicans know a lot of women are voting to restore abortion rights, full stop. Compared to the hundreds, if not thousands of dollars that it would take for us to travel out-of-state to receive abortion care, $47 is nothing. You can’t buy my vote, let alone for such a pathetically low-balled price. I’d rather lose money and reinstate Roe V Wade than gain money and leave people to suffer.