Rule 34

SEXY AS FUCK
This article has a lot of sexy images/words, which means that it most likely would pass for erotica. You may just find yourself fapping about halfway through, or you may explode from spontaneous combustion. CAN YOU HANDLE THE SEXINESS!? *fap fap fap*

Wikipedia
For the people that have lost their sense of humor, the nerds at Wikipedia have an article about Rule 34.

Rule 34 is the 34th rule of the Internet. It has a website that has porn of everything.

History

In 1985, the Internet had no rules. Everything that people could do, they did. That year, the United States government decided to make some rules for the Internet. The governors thought that rules would stop illegal stuff on the Internet. Rule 34 was created by a porn addict in 1987. The rule decreed, "Everything that exists, with the exception of Rule 34 itself, has porn of it."

Rule 34 website

The Rule 34 website was created in 1999 when hentai addicts and Mario fans decided to make porn of Princess Peach. Sonic fans got mad that there was no Sonic porn on there, so they decided to make said porn. And the rest, as they say, is history.