I understand in the US, you can be liable for copyright violations if you use media (pictures, movies, music, etc) that you do not own
Although it might be rare for someone to get into trouble for using porn clips in a game, I personally wouldn't want to risk it
So I was wondering, if I were to make a game using real porn images and gifs, purely for fun/hobby and not for profit, and have someone else upload it to f95zone for me, would I still potentially get in trouble for copyright or piracy violations?
I would also appreciate any other insights or advice in regards to using real porn content in the US.
It depends on where you are, on the use you make, and luck.
As far as USA goes, it was already indicated, if you make a profit from it without paying royalties, it is a copyright violation.
The "fair use" is however allowed, and if you go around for porn, you will find tens (probably hundreds) of porns that are clear references to movies and series like Star Trek, War of Thrones, DC and Marvel characters, etc. with the "parody" word in it.
Parody is considered "fair use".
Will that, i.e. referring to parody, be enough to avoid a successful copyright lawsuit ?
Well, most often it is not a matter of being successful, it is a matter of creating a cost for you, i.e. a company does not need to be sure they can win, they just need to know that they will create a cost for you you cannot afford.
At the same time, even if as far as I remember few years ago USA still had the biggest porn industry in the World, considering many judges in USA are elected to their position, it would probably be difficult for them to find a judge that likes being labelled as "the friend of porn" - not good for elections

.
All in all, as someone else mentioned, at maximum you would probably get a "cease and desist" (which is cheaper even for them, technically, as far as I remember a "cease and desist" is not required to be sent by a lawyer), not a lawsuit.
About that parody element, do the people who made e.g. "War of Thrones" and HBO, or DC comics, or Marvel, not know that there is one or more xxx parodies around and that is why you never heard of a big lawsuit from them ?
They can pretend not to know, to avoid the embarassment of somehow admitting in public that somebody somehow connected to it saw porn, but I cannot believe it even for one second that they do not know - notice it is true that AFAIK often the parodies change a bit a name, or modify a bit the costume so they say it's "cosplay", but it is still obvious that e.g. the character is supergirl (down to the "green slime" which is obviously supposed to be kryptonite) or Wonder Woman.
I am not considering stuff like Alice in Wonderland because it could be argued that the original story should be more than old enough to be in the public domain, so insofar as you make your adaptation, it would still be good.
For "Game of Thrones", they even hired real porn actresses for the role of some of the girls of "little finger", and they were not just extras, they had actually some talking scenes and therefore mention in the cast, it would be damn hypocritical to complain about porn parodies being made of it, and there is the "parody" defense.
Incidentally, look here on F95 for "real porn", there are a bunch of games with it, maybe you can also ask their authors for advice/feedback.
For Patreon, Subscribestar etc. , it goes as much by luck as by rule.
They rules may or may not refer explicitly to porn and the case you present, but the simple truth seen with other games here on F95, is that something may well be in the list of things they forbid, and still get money through them.
An author that has become known for his model of Lara Croft is making (while "milking the cow", I would say :-D) an adventure/animation with horse and Lara for a long time, and has apparently still thousands of subscribers on Patreon.
At the same time, a developer was threatened to be kicked out from Patreon because his game had incest and bestiality (specially, with a dog and, separately,
a horse) and either was enough to be kicked out, and they even said he tried to make a patch to put them back and distribute it even outside Patreon, he would still be kicked out.
I know well because I made and maintain the patch to put back the incest (someone else is taking care of the bestality), and I was in contact with that developer, and basically, it seems Patreon reserve the right to decide what they will allow you to do or not, with almost no appeal possible.
Though talking about Patreon, Subscribestar etc. can touch the "for profit".
It is true that in theory, even if you do not make money from it, they could still claim copyright infringement, but it would make it even less probable that will do anything more than at maximum a "stop" (the "cease and desist", saves them the hassles of a court case), even if they ever decided to do something.
If you are making money out of it, it makes more possible, if not more probable, that they could do something, though depending also on the amount - copyright infringment is civil lawsuit for money, if their money loss and your money gain from it is basically nihil, they can still claim damages in theory, but in practical terms most often they would get at maximum the simbolic award and the legal fees.
Yes, Patreon, Subscribestar etc. are considered as making a profit out of it.
Sorry for not giving a simple answer, but in reality, this what you can expect from a lawyer (not a laywer, but I worked on legal stuff, including criminal) - they will give you advice, but they are not responsible for what you do, the responsability stays with you (or in other words "we won", but "sorry, you lost", said the lawyer to the client

;-)).
From another perspective, but that is my personal one...
To use real porn, you would need to have real porn with the right character and the right scenes filmed in the right way to fit exactly in the story you want.
Not impossible, but quite complicated. And if you have to try starting to use "gen AI" to create videos for that, it is not said to be so easy and fast - plus, even if they are porn actresses, there either the result is not so good, or if the result is close to perfect, you risk to go against another law that has nothing to do with copyright and is directly criminal.
I would check if there are models that represent the actresses you want to put in the scenes, and create the 3D images - yes, you will not have easily video (that is more complicated), but you will be able to do them the way you want, and in that why it is even less probable, and even less possible, that you get any legal trouble.
Hint, even in that case, remember "parody", and I know it is not your case for now, but if ever you decide to do something with DC, Marvel, characters from movies, other than "parody", remember tricks like one cannot register, claim copyright, trademark on names like Natasha (Romanoff) or Lara (Croft), etc.
Natasha, because you will get a bunch of ladies from various countries in Eastern Europe where it is quite diffused asking you for money :-D, and Romanoff is not so diffused in Russia, but it was the family surname of the last Czar, so, not exactly something invented, non-existing and uniquely linked to a Marvel character.
Lara, because Lara is a name that existed from long before (no, it was not invented for Dr Zivago), and they admitted themselves that "Croft" they took randomly from a phonebook, so, again not something that they pretend they invented and is unique (because if they pretend it was unique a therefore worth money in itself, the people with that surname could the same and ask them for money) - though it is true that most people making parodies change a bit typically keep the name and change a bit the surname, often towards something more "evocative"

;-D, since they give anyway a look that is recognasible.
P.S. I focused on USA.
In some other countries, if the use is limited and you do not get any money for it, it is enough to recognise that you took bits from around to be OK.
Or you can pay a small amount (well, maybe "small", is typically based on what you are creating, the price and the size of the expected audience, though they can also have specific parameters for software like expected number of players) to an organisation that manages the rights in that country for all the copyright owners, and then you are covered, though it also depends on whether it is music, images or part of movies/videos (in general, music is the simplest, movies/videos the ones that may come more expensive/complicated).