in general, we don't accept curse words on CS, but occasionally a few can be overlooked if it's posted in a reasonably private topic and not aimed/targetted at any other user.
E.g. in some RPs the characters are angsty teens and occasionally let loose the 's-word' or the 'b-word' which I will most of the time overlook UNLESS there is a complaint or unless there is a huge amount of swearing going on. Basically, if no-one in the RP reports it then I assume it hasn't bothered them and so it's not a huge deal. However if someone is continually posting swearword after swearword they can receive a board warning and even be banned as a user recently found out.
If it was posted in a more public thread like the pets discussion thread then it would definitely be censored out if I saw it, because there are a lot more people viewing that topic and they are not able to predict there might be bad language before going in to read the topic.
Many other words e.g. the 'f-word' would never be acceptable on CS, and I also don't accept people replacing half the letters with *** because it's still very obvious what the word was.
If by the 'a-word' you mean ass/arse then I do not view that particular word as a bad curse word and you can use it on CS without getting in trouble (e.g. saying 'wow this cold weather is a real pain in the ass' is fine), however if someone uses it with the purpose of offending another user (e.g. saying 'wow you're an ass') then they can get in trouble because bullying is against the rules anyway.
When it comes down to it, if you are offended by someones language then you should feel comfortable reporting the post for a moderator to come see it, even if you're not sure if the words OK or not. If the word is deemed inappropriate then it will be censored/removed from the post and the person who wrote it may get a warning if they had a particularly bad potty mouth. If we decide the word was ok, we will just close the report and there won't be a consequence to you for reporting it. The person who reported the post would always remain anonymous except to the staff member dealing with the complaint.
So, if you have a problem with something in particular, feel free to report it for a moderator to check it out

We do like to keep the language here safe for kids, but we can't read everything, so you can help keep the board clean by reporting naughty stuff you see along your travels.