Jealousy has nothing to do with torture.
It doesn't even have to be a negative emotion. There's a reason evolution gave it to us.
Generally I could think of 3 distinct types of jealousy:
1. Black.
You've got jealous of the neighbor's car - so you want to burn it to the ground. Or report him for tax evasion, idk.
2. White.
You've got jealous of the neighbor's car - so you try to find new ways to earn the money and buy yourself one.
3. Horny.
You see your neighbor fucking the car- Ok, let's stop.
In general it's pretty clear how this particular instinct operates: you see someone getting what you desire (your crush, for example) - so your brain injects you with chemicals to motivate you more to get it (to fuck this crush of yours in this case - so brain injects you with the 'horny hormone').
As you can see from these the only actually bad type of jealousy is the Black one. And even it has nothing to do with torture. It's more like anger. Not a very good thing to blindly follow, but it motivates the hell out of you.
Jealousy is not a bad thing. Or a bad emotion.
You just need to know how to control it and not to go off the rails - but that's the case with literally every other emotion. Including love or happiness.
Jealousy is a contextual and complex emotion. Just like any other emotion.
I think you just oversimplifying it.
You don't need to identify with anyone to feel what other people feel.
That is a MAJOR part of evolution of our brain as the social creatures.
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I... don't really see how betrayal itself can make you horny. Can you elaborate?
I can see how it could "not hinder your excitement" - but then it's just a non-factor.
I already explained how jealousy can do it, but betrayal..?
IF we establish the primary function of the PORN story as to make you horny, of course.
Just like for horror story - it would be to make you scared.
For action - to make you hyped.
And so on.
And by the way, why jealousy is a torture porn, but betrayal isn't?
That's just a "character development".
It is a part of every good character in every story - so yes, it's absolutely a good thing.
If done right.
But becoming more sexual - even crazily so - is not really an NTR thing. It's... It SHOULD be, at least, the case for most of the characters in porn stories.
Every good character needs to change in some way - that's the law of drama. And if it's a porn story - then that's probably would be them becoming more sexual.
Look at some harem... bdsm... corruption games, idk? And how there girls becoming cock-crazed uber sluts (and it's all wholesome and cute).
Let me ask you this:
What is the main emotion in NTR stories?
You know the main emotion for Horror, for Action, for Romance, for Comedy.
So what's it for NTR?
You wot m8...?
You are the first person that I have ever met in absolutely all my years that has ever said that anything good ever came out of jealousy.
I'm honestly not buying what you're selling there. You can be motivated to be better, do better, achieve more, without a negative feeling like jealousy. Historically speaking, I don't think anything good has ever come out of jealousy or envy. No one likes feeling jealous, much like no one likes feeling angry. It's not a good emotion, it produces stress hormones, it's literally bad for your body.
That said, I will admit that I have not studied the subject to great depths, so for all I know there may be some truth in what you're saying... but it'd take a lot more than some random dude's words on the Internet to ever make me think that anything good can come out of jealousy of all things...
Moving on.
The article you linked on Mirror Neurons itself makes it pretty clear that even scientists don't really know what those do in humans, how many of them there are, etc. Digging into the sources of that article will lead to even more rabbit holes. Also not sure if mirror neurons trigger when reading a VN. They generally require an actual member of the species to trigger from what I read, so they probably don't apply to anything in here, except for people that get so emotionally invested and have such a strong imagination that they live the story much more vividly than is advisable tbh.
Moving on again.
I don't know how betrayal makes people horny exactly. I just know it does because other people enjoy that aspect of netorare. It's been there from the start after all. The "old-school" formula of NTR was "girl falls to dick > girl and the guy that cucked her show off to the guy that was cucked, usually via video > cucked guy commits suicide". Jealousy tbh never even got into the equation there I think. Just betrayal and despair over having lost their loved one.
Admittedly, I don't think the people that liked that classic scenario sympathized with the cuck in any way, and were rather taking sadistic pleasure out of his suffering... but by that same token, masochism is a thing too. There's people that literally get off from being whipped and basically nothing else, and that's not just a thing in hentai.
For some people, pain can be pleasure. How? Why? I dunno. It's just a thing that is. There's also the matter of catharsis, maybe? I'm not sure if that can be applied...
Either way, both the jealousy and betrayal parts are part of the "torture porn" aspect of NTR. Indeed, a lot of NTR's detractors have called it emotional torture porn. I never meant to imply that the betrayal part isn't if the viewer feels it, rather that it's something that the viewer doesn't need to feel. Same with the Jealousy.
Moving on once more.
You're missing some details about the slutification and corruption angles from what I said. First of all, I treat these things as distinct things. A lot of porn games have slutification to some degree or another, but few of them actually have corruption in any real sense. After all, being sexually promiscuous or the like doesn't make someone bad as long as they're careful about their smuttery, and, depending on the kind of world they live in, there may be no real consequences at all to it.
Corruption is about betraying who you are and your original ideals. This is something that's pretty much inherent in NTR. The person that's being taken away betrays the person they love. Betrays the love that they feel. It goes beyond simple lust into outright madness. It was present in the old classic formula, where the girl was so obsessed with the dick of the guy that corrupted her that she didn't care that she was doing something horrible to the person they loved. Most of the time, she never found out that he committed suicide because of the videoes and if she did, she didn't care about that either. It went beyond becoming slutty and into becoming a monster because of excessive lust.
We have that here with Laura too. In the family ending, she's not just obsessed with Luca's dick, she's SO obsessed with it that she betrays Harry completely and helps Luca ruin his life actively, just so she can have more dick. She doesn't care about her own children at all, because while the kid is not Harry's, it's definitely still her own, and she still doesn't give a single flying fuck about it. She doesn't even realize that if her old self met her new self, the old one would absolutely murder her out of sheer horror and denial that she could ever become something so twisted and terrible. We have something similar in the Fallen Hero ending. Or the Abrupt ending. Or the Aya path.
As I said, it's really well done and entertaining to watch and read, for me and others as well.
Lastly. Emotions.
You're making a big mistake that a lot of people make... and that's assuming that everyone will feel the same things when watching/reading/hearing something. That's not the case. That will never be the case and has never been the case.
Some people might not feel anything at all.
Even beyond that, stories aren't there necessarily to make people feel anything... other than feeling good in a general sense while they're having fun. Stories exist for many, many reasons, and I believe that entertainment is the most important part of them. APBLU is definitely very entertaining for a lot of reasons.
At least for me... and a lot of other people if the review section is any indication.
The set-up may not inspire jealousy in you, and you may think that jealousy is the main component of NTR, but I and plenty of others will disagree there, much like I'm sure you'll find people that disagree with you in terms of what they think the "main emotion" is for any other subjects.