The only users who can delete your forum posts are the Moderators and the Administrators. The other users can only delete the comments that were made on their own profiles.
That is correct BSD. Even the owner/original poster of a thread cannot edit or remove any content within the thread. Only Admins and Mods can do that. Each user may, however, delete any comments made on their own profile. Any time these comments, or when an Admin or Mod removes your posts or comments you will lose the associate AP gained for the post.
If you have any further questions about post/comment removal feel free to drop by my profile and ask, however I'm considering this question answered and locking the thread to eliminate the risk of numerous users repeating the same information over and over.