Let's explore the definition of Porn, shall we?
PORNOGRAPHY (n)
printed or visual material containing the explicit description or display of sexual organs or activity, intended to stimulate erotic rather than aesthetic or emotional feeling
Porn isn't allowed here. What is allowed are certain, brief, classy, not-even-really-all-that-specific, (and believe you me, I've seen the specifics. Even the most depraved of Suzy's escapades are more like a brisk summary.) sexual descriptions and references for either atmospheric, romantic, or comedic effect. Romance stories include sexual references to emphasize the bond between characters... If they ever do that at all? Romance is actually one of the more sexless genres on the site. Madglee added in a sentence about butt-orgasm to MCIGOAKT in order to establish the feeling of being an up-and-coming Pharmacist living in a rundown apartment in a rough neighborhood where your fiancee is one of the few upsides. Horror stories include graphic sexual acts and references to shock, disgust, and emphasize the trauma of the event.
And others still (Namely Endmaster, the most prolific descriptor of weenis and wongus on this website) write about it because, frankly, absurd and morally depraved sex acts are inherently funny. Especially if they incorporate a healthy dose of tonal whiplash. Well, that and it adds a layer of delicious dramatic complication between the Eternal and that stupid elf milf everybody's always yelling about, but that's definitely more the fault of perverted weeb readers than his.