If someone wants to get past this type of filter, it is easy. How about these variations: cokc c0ck cocck c_o_c_k fukc fcuk fucck siht sh!t shti or "h"-"e"-double hockey sticks. (I find the last one particularly offensive)

Do you need to block these? They are really not obscene, or are they?

Block the 2-3 worst offending words if you have to, but you might want to leave the rest alone.

Censorship is a slippery slope. In the US, a TV station can be fined by the FCC $550,000.00 for airing a show/movie where a soldier says "War is hell!". Now thats obscene!

-Eugene