Pornography is the primarily cultural product associated with Coomers. It is any material designed to be sexually appealing (to at least someone). Porn is primarily catagorized as either softcore or hardcore, based on whether you see anyone getting dicked down. There are also many genres, including pin-ups, erotica, 1970s porno movies, fetish porn, fat fetish porn, and Sgt. Frog. As the level of variety implies, most porn is designed to meet someone's specific sexual tastes, and may seem goofy or even gross when viewed by other people.
Porn on Reconstruction Era
Currently there is no dedicated place on Reconstruction Era to post porn. However the community as a whole has a fraught and storied relationship with the stuff.
The NSFW Channels
Back in the day, the RE discord actually had channels to post pornographic content. There was #NSFW for general audiences (read: straight men who liked anime) and #gay-NSFW for gay stuff. Most of the porn posted there was drawings, but there were a few images of people as well. There were a couple Coomers who mainly used RE just to look at the porn channels. When these channels were deleted for making the server seem seedy, the Coomers went with them.
The collection of weird fetish porn possessed by 1234fireball is known as the Arsenal. It predates RE by a few years. It's mostly shared with other members of the community via DMs to troll and piss them off. There was an 'arsenal' groupchat which is in practice just a worse memes channel.
As the #cursed_images channel is labeled 18+, you can technically post porn there if it fits the channel theme. Please don't...