For those of you less familiar with reddit, some sub-reddits like to name themselves [topic]porn, where you replace topic with anything. Then everyone posts pictures of that topic. It doesn't mean actually porn.

http://www.reddit.com/r/ShittyMapPorn/

Edited 5/23/2015 09:29:21

This subreddit also isn't actually porn: http://www.reddit.com/r/spacedicks

It's unrelated, but reddit has some weird subreddits like "animals being jerks." After that scene in Interstellar where Matt Damon is a complete dick in space, someone decided to compile similar "people being dicks in space" scenarios in to a subreddit- and it turned out pretty funny.

*sigh*
I fell for it.