Comic Market, or Comiket, is a twice yearly event that showcases self-published comics. In the past, it's also showcased obscene amounts of flesh. Real flesh.
Like most nerd events, Comiket is a cosplay magnet. Cosplayers, like Ushijima Good Meat, not only pose for pictures, but they also sell their own CD-ROMs filled with sexy photos. Since the pictures leave little to the imagine, so do the cosplays.