The joker who runs that site,skinhead or some such name, had to give the posters there a virtual spanking because they refused to refrain from dirty sex talk on the board.
(which explains all of the bent up frustration they have towards you.)
So he decided to refuse all sex threads.... at dirtyunderpants.
True story.
Okay, you're added. Happy? ;^)
I think his name is "foreskin"