Actual incest is illegal, but depictions of it in media are not, hence why Game of Thrones (and many other movies and TV shows) are able to depict it so graphically. The fuss about it now is because of payment processors being puritanical dicks who have decided to control societies morals.
I was reading a book by a female psychiatrist on women's health recently. My wife told me to read it as she has PMDD (an extreme form of PMS), it was genuinely fascinating and taught me a lot about women. Also about men and my own health - much of it was transferrable. It was about hormones and how modern life screws with them and what that does to us. I thought it was interesting that in a bit about sexual desire she noted; the incest fantasy was very common with her clients. If her female client talked to her about experiencing sexual dysfunction due to waning desire, she would talk to them about what turns them on and often it would come up. She encouraged them to explore it via roleplay etc. The way she talked about it was very matter of fact, this is kinda normal in the same way that it is kinda 'normal' for people to like BDSM. This is the incest fantasy, about other people committing incest, not actual incest, which is something very different. Society imprisons itself through pretending that most people don't have some sort of unusual desires somewhere. The prevalence of these fetishes deemed "abhorrent" to society should be enough to say this isn't actually that weird, and if you just stopped being all weird about the fact that people enjoy fantasizing about these things, then we'd all get on a lot better. For 99.9% of people, their fetishes are just fantasies and they don't harm anyone.
