Kayfabe, in case you haven't heard about the greatest thing ever, is a rule among pro wrestlers which forbids them from ever breaking their onstage character, in order to make their matches feel more "real." Idols have a similar concept, except that every one of them plays the exact same character: the single virgin who doesn't even know what a human penis looks like.
But who's also a very bad girl.
According to Ricky: "Everyone knows idols are human beings and have human relationships. But as long as that fact is under wraps, everyone can operate under the kayfabe of plausible deniability and keep the fantasy alive -- the fantasy that they have a chance with the girl. But if there are undeniable facts out there showing that the idol IS in a relationship, then the kayfabe doesn't work anymore." And the consequences of that can be horrifying.
In 2013, Minami Minegishi, a core member of AKB48 (probably the biggest and most famous idol group in Japan), was caught leaving the house of a boy band member after spending the night with him. As punishment, Minegishi was demoted to the group's "trainee" team, and forced to apologize while crying her eyes out on their YouTube channel for her "thoughtless deed" of being a normal 20-year-old. She was also (most likely) forced to shave her f*****g head.