The closest thing I can equate to the majority of adult games and visual novels would be a pornographic TV show or mini-series. Having a plot and relationships that extend for multiple hours of view time for IRL porn is extremely hard to pull off. The scheduling requirements for the actors and actresses would be completely different from regular porn. Plus, the majority of them can't actually act. Someone making an adult game can spend 30 minutes on getting an expression right, there is no time for reshoots in the porn industry (based on the number of boom mics and cameras appearing in frame I've seen).
Adult gaming is about the only way to experience these extended plots that also allow for some character development. Not to mention their interactive features such as the ability to include or exclude certain fetishes, renaming characters and relationships, choosing alternate story paths, etc. Plus, as a dev who made an AVN with fantasy kinks like futanari, no porn studio is going to spend the money for the vfx to pull that off IRL. Only way to see it is to find the little of what's out there or make it yourself.
As for tags, I'll go with pregnancy, realistic incest, and harem as my top 3. Oh and by realistic incest I mean two people who actually look related, not the real porn version where they often find the most dissimilar actors and actresses and do a half-assed job of fitting incest into a scene clearly not intended to be based on that.
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There is an additional point that matters to me: 3d renders and 2d drawings don't result in any physical harm to a person.
- It's impossible for there to be a sex-trafficked person involved.
- No risk of STD, pregnancy, emotional damage, etc.
- No worries about consent, coercion, fair pay, etc.
- Incest, bestiality, rape, etc. aren't actually happening. (Despite what payment processors think)
- TBH, I'd rather a pedo have a hard drive full of fictional lolis than a single pic of a real child.
Let's face it, the porn industry is extremely brutal towards actresses that aren't big names. The famous meme of Piper Perri surrounded by 5 black guys is funny at first glance. But did you notice she has braces? These actresses usually come from terrible backgrounds and are starring in porn to pay for stuff like dental work, drugs, debt, etc.
Also, an uncomfortable amount of them appear to be high, drunk, or mentally not there during sex scenes. The burnout rate is huge and I'll bet a lot of the popular pornstars people are familiar with no longer do it anymore. They just made so many per year, that it seems like they were around for a long time. As a result of all this, real porn is not as sexy to me as it used to be, it's become so sad and depressing.