It really depends on how you define 'vanilla'. Yes, a lot of it is economics, and generally the more popular you are, the longer you can go without taking it in the ass or something else non-vanilla.
I agree with a lot of what you say, and using Yua Aida’s adult filmography as an example, I think is useful to understand in concrete terms the specific genres an AV actress usually takes part in Japan if she stays for enough time in the industry: group sex, soft SM, sex nonstop for long hours, etc.
Outside the specifics acts, the way to describe it is complicated, though. As you pointed out, the definition of
vanilla might change between people, and specially if you are used to watching porn or are very flexible in your sexuality the more sex acts you will consider vanilla that other people wouldn’t, like anal or faked-homosexuality for example. I will also talk about using the word
degrading later.
But there's a lot of, let's say, psychologically intense sexual situations that are extremely common in mainstream JAV. Bukkake, group sex (generally 2 guys, but sometimes a room full of them), fucking your fans, etc are very much standard in mainstream JAV. The most common one for mainstream JAV actresses that is pretty troubling IMO is how common rape scenes and other 'questions of consent' scenes and movies there are. Everything from 'the repair guy taking advantage of the hitozuma' to 'senpai/boss fucking the girlfriend/wife' all the way up to 'let's kidnap this woman and rape her until she's trained to be our sexual pet'.
I might agree that seemingly nonconsensual sex scenes might suppose some problems from society’s perspective. I’m not entirely sure, though, that they are
psychologically intense for the AV actresses. Was that what you mean? I’m under the impression that these films might be psychologically intense for the actresses as well, but not as much as you seem troubled by them. Outside hardcore SM, which often is not entirely acted (more like ‘consented’, but still painful for the actress), soft SM scenes are not supposed to be painful and are acted. For example, forced cuckold, a frequent scenario in Japanese AV, might seem psychologically intense for the viewer, but I doubt it is much more psychologically intense for the actresses if the sex acts are the same as a softcore movie (let’s say penetration and oral, no anal or group sex). The psychological factor is absent, there is no infidelity or rape actually taking place, it’s all acting.*
her final movie where she had sex for 2 hours by a succession of guys non-stop -- supposedly the movie that made her quit the business, although she kept doing nude modeling for a while.
What gets more troublesome is not the AV plot, but the specific sex acts and how much physical stress, STD risk, and lack of enough remuneration they suppose to the actress. Here you mention one: sex in succession for long hours with many partners. And usually filming hours are much longer than the edited time of the final movie, so it was probably way more hours. If the remuneration is not enough, some of these roles are not as attractive as just plain escorting or working for a soapland. You usually get payed more, but sometimes not as much as one would think. If an actress joined the AV industry hoping that this way she wouldn’t have to had sex with as many partners or work as many hours as in a soapland, but by her fourth AV production she is being asked to have long sessions of sex with many partners, then the cost/value balance starts to turn in the other direction.
There's AV actresses that are popular enough to do it for a few years to build up a nest egg, or find a sugar daddy or whatever and retire when they do anything they consider too degrading, actresses that do a few movies to pay off debts, or feel that being in movies is too taxing and quit, there's some that do it for a while and keep doing more and more degrading things because they don't mind and they get a paycheck, etc.
I’m not picking on you, but I wouldn’t use the word
degrading, it is too tied to personal values. A lot of people consider porn, even the most softcore porn, degrading in nature. I struggle to find a better word, but I prefer using the word
tough. Some genres are tougher than others. And by tough I mean they are physically more intense, have a higher risk of STDs, or are not as well remunerated.
A professional AV actress might consider a very well remunerated movie that includes soft SM less
‘degrading professionally’ than a completely softcore movie that pays her just above an escorting job. More than the sex acts, it would be the remuneration or work environment what could be considered degrading by an AV actress. Again, I rarely read or hear porn actresses use the word ‘degrading’ at all, maybe ‘tough’ is not the best alternative, but it tries to be more neutral.*
Some get famous enough to turn their careers legit, or some work for soaplands or delivery health places after or even during their AV careers. There's more than one "career path" for porn stars.
I would stress,
“a few get famous enough to turn their careers legit, and a lot work for soaplands or delivery health places after or even during their AV careers.” That the first thing happens sometimes in Japan is outstanding compared to the rest of the world, but the odds are still low. In practice, the AV industry is more tied to the sex industry (host clubs, escorting, health delivery, soaplands), than to the entertainment or film industry, a lot of AV actresses end up in other parts of the sex industry after they finish their careers, or as you mentioned it, a lot do it simultaneously while it.
The celebrity that got started as an AV actress is still a shot in a million, but Japan is more open about it than other countries.
*This comes from comments of the most vocal AV and porn actresses, usually those that stay for a long time in the industry, I wonder how much these perceptions might change between ‘amateur’ and ‘professional’ AV actresses. The psychological impact might be higher in amateur actresses that are not as vocal as their professional counterparts. One could also argue that professional AV actresses lie and hide a lot of the psychological impact on them, either to don’t hurt their careers, or as a form of coping. Ideally society could discuss this too, but the danger of turning patronizing is so big I prefer to avoid it.