It's interesting to see the defensiveness of the inherently misogynist nature of 'idolatry' by throwing out the "it's a job" argument or the average age of H!P.
There's a few forces at work here, right? Objectification. Female sexual agency. Slut shaming.
You don't have a fandom without objectification. Look at ANY thread on any idol forum and it's full of it. Discussions of 24 year old Sayumi involve how she's a 'true and pure virgin'. We rank our favorites a lot of times not based on talent, but on cuteness. They gain or lose our favor based on their latest hair cuts or costumes.
Likewise you don't have a scandal without some good ol' fashioned slut shaming. Even in the beginning of this very discussion, somebody refers to American artists as "drunken whores", as if that's the only option aside from being the aforementioned true and pure virgin. And yet, these are girls that from the beginning have been performing music with lyrics that are thinly veiled sexual innuendo. Wanting to go for Morning Coffee (presumably the morning after a sexual encounter), having nice love machine bodies. School girl uniforms. It's an amazing display of the Virgin-whore dichotomy, further exaggerated by the Love Ban Law.
Which brings us to female sexual agency. Let's be realistic, when we're talking about H!P idols finding romance, we're overwhelmingly NOT talking about the Kenshuusei. So put that out of your minds. The average age of Berrykyuu is what, 20? And until recently (what's it been, a year and a half since 9th gen joined?) MM was in that age range, too. It's entirely unreasonable to expect 20 year old women to never date or engage in relationships with the opposite sex. 20 years old is around the age where you start wanting to make lasting relationships, to discover what you like and dislike about a potential mate, and what it is that makes you feel good or sexy or powerful. And yes, I mean that both in and out of the context of the bedroom. In a lot of ways it's the reason that I feel graduating out of idol groups once you get too old is a blessing. With any luck they continue to get regular work, or live off the royalties of their old work, but hopefully they also go experience life and love and yes, sex. Because at that age it's entirely reasonable to WANT those things. I know, women wanting sex, such scandal.
At the end of the day, there's a lot that's wrong and unfair about 'idolatry'. The victims end up being the girls. Their characters might be super-human, but it's so unfair to expect young girls to sacrifice their humanity in order to appease and unforgiving fanbase. That they sign these contracts at such incredibly young ages is the real shame of it all.