from the rules 4) Please refrain from using profanity and foul language on the forums. If you feel the need to swear please replace the word with asterisks (*).
But I don't think the moderators really mind as long as you don't over use them.
i'm fine with most profanities, as long as you don't cross the border, e.g. no diseases or discrimination. if in doubt just wait with posting until you've calmed down a bit.