Creatures created in the game Spore that look like pornographic images. While Maxis/EA tries to remove what they find, much of it slips under the radar and ends up in your Spore game, or in the Sporepedia, the database for creatures made in Spore.
Example 1. As Ted scanned the Sporepedia for new creatures for his game, he came across a lot of penismen, also known as Sporn.
Example 2. When Frank reached the Space phase of the game, most of the planets he found were populated with Sporn.