I think tagging is a wonderful system and a great kindness posts can perform for the sake of others, but that kind is a choice and lack thereof is not inherently problematic. The absence of kindness is not meanness, it's neutrality.

I think that what's happening here is that

1. The vast majority of any <thing> is poorly made, but because there are better alternatives, the poorly made ones rarely see the light of day

And

2. The more specialized or niche something is, the more likely it is to stand out despite being poorly made

This includes racist garbage and weird fetishes, yes, but also any other game whose main selling point is its uniqueness instead of its quality.

It's not always about horniness, per se. For example, I'm trans, and giving birth is something I'll always want but probably will never get to experience. So maybe I want to experience a "power fantasy" of sorts where my trans character performs dark rituals to give birth to eldritch abominations, all so she can experience motherhood.

I'm sure there are other experiences that people would want to rp but not necessarily to experience irl. It certainly overlaps with kink, but it's not like you're masturbating at the table. You're telling a story with adult themes, not (necessarily) writing erotica.

How many gonads did king Soloman request in Neuteronomy? I'm struggling to remember, and want to ace my next Sex Bible Study.

I just want to be considerate, and it gets hard when the tags are black and white, instead of allowing for depth.

This I agree with, and I think your call for a "suggestive" tag is a great way to fill in a lot that missing depth.

I believe reddit had a system that allowed for communities to have their own tags, which i feel is a good way of crowdsourcing a system like that in it's abscence officially, while allowing for each community to have a level of depth appropriate to it's specific topic. Maybe I should ask around for something like that to be added to here? I know repost tags worked in a similar way on tumblr.

Does that need a specifically developed diceroll mechanic though? Seems like there's a huge roleplaying narrative landscape that doesn't need to use specific gamerules for thinga like eldrich pregnancies. Or it'd be pretty easy to ad-hoc without making it a central theme of the underlying mechanics.

The worst part of this is the "This is part of the story"

an rpg horror story staple

Does anything need mechanics? You could just rp everything, after all.

I'm not saying you need something like FATAL, btw, the system I'm referring to is The Sword, the Crown and the Unspeakable Power. It's a pretty normal PTBA system, plus a handful of moves that let you gain an advantage when you sleep with someone (as you might expect for courtly intrigue in an 18+ setting). There's also one class that lets you give birth to eldritch abominations, but that's less of a 'roll for pregnancy' thing and more of a dark ritual. It doesn't have to be done out of a deep yearning for motherhood - that was just the direction I took it because it resonated with me.

The mechanics are the medium through which players relinquish control of their roleplay. They're sort of what mediates roleplaying, I think, by providing a sort of arbitrary and neutral interface to both limit and move along characters.

I can roleplay all day and use real world knowledge to back up how my character can pick a lock, but if there's a mechanic that made me roll dice and I lost, I have to roleplay why that character just couldn't get the lock picked despite it all.

My main point though was more an allusion to game mechanics not needing to be overly specific or defined by manuals. But then again I like cooking up rulesets and customizing campaigns. Or rather I did in the Ye Olde times when I socialized.

The mechanics are the medium through which players relinquish control of their roleplay. They're sort of what mediates roleplaying, I think, by providing a sort of arbitrary and neutral interface to both limit and move along characters.

Precisely. Which is why it feels different from improv. Rules and predictable-but-random outcomes add verisimilitude to a game.

And the closer something is to the game's core experience, the more likely it is that a rule (instead of a ruling by the gm) is needed. So if you're playing a game that revolves around intrigue and seduction, you will probably want some rules for that. They don't have to be overly complicated, but they will need to exist.

Is this comic part of a series?

Not as far as I know, I found this in a comment.
Also I found the artist and it seems to be standalone.