A few thoughts, as someone who is into BDSM and some dark romance:
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Dark romance, like all kink (because it is exploring kink), needs to have proper boundaries and allow consent to be given. Proper trigger warnings are part of this. I may have consented to what I read on the back cover and/or mediocre trigger warnings, but if those boundaries that were set are crossed, then I believe my consent was violated. I do not want to read anything related to several topics, and if they come up without warning in a piece of media I am reading, I would find that extremely upsetting. It's the same in BDSM. Set very clear lines, do not cross them, or even push that boundary. If pushing the boundary is part of the play, then the boundary actually further.
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Why is someone immoral for wanting to play something with a sex scene in it? That seems taken for granted in the post. I may not agree with said person's taste, but if it's not explicitly immoral (ie: desiring sex scenes in a game with exclusively underage characters), why is that a problem? Someone might want to play games that explore sex, for fantasy, pornographic, or other artistic reasons, and those categories can all overlap. I take issue with people expecting art to be changed to fit their desires, but none at all with someone choosing to engage with media that suits their tastes. The same applies to dark romance. Some lines, I agree, should not be crossed, especially anything related to children. Otherwise, consenting adults can explore their fantasies however they wish, as long as consent is respected and everything is done safely within the boundaries set.
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All things have nuance. There is no issue whatsoever that doesn't have some degree of nuance. That doesn't mean hard lines don't exist, but it does mean that all issues have multiple facets and not just two explicit sides. Just because something is fiction and the topic isn't taboo doesn't mean it's okay, and just because a topic is taboo doesn't mean it can't be explored safely. A book could have every topic covered with a trigger warning but go about exploring the topics in a way that is unsafe or misinformed, and reasonable minds may differ on what that means for any given topic.
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Smut can be addictive. I don't know who would believe otherwise. Any easily accessible source of gratification and dopamine can be, or even sources of frustration or anger. I don't think that is a relevant question to dark romance specifically, but one to ask about all romance, and all entertainment we engage with.
You could try a Lemmy app that gives you a more reddit-like experience. There are several. I use Sync, but only because it's what I'm familiar with from the reddit days. There are plenty of alternative (and often better) options. I can find communities from instances my instance federates with in the search bar, and I even have several different accounts in different instances (world, beehaw, hexbear, etc) to see content my instance doesn't federate with which I can switch to with a dropdown menu easily.
Edit: I assume it's been explained, but not every server/instance talks to each other instance, called federation. This is often for political, spam, or harassment reasons. It may be worth using alternative accounts or using Lemmy from another instance logged out if viewing content from those communities you don't federate with is important to you. The big instances federate with mostly everyone, but there are always exceptions.