Some 4chan regular explain the joke?
From left to right.
technolo
gy,
coo
king,
video
games, hentai/alternative (also known as "
deviant")
The normal hentai board /h/ is basically restricted to consensual sex (often in the missionary position) for the purpose of procreation. Everything else that's hentai goes on /d/. Now tell me, what is the girl on the right doing?
edit: fastposted, but I give moar hints!