What if I forget to add a CW to a post?

Honest mistakes can and do happen. Everyone forgets things once in a while. Keep in mind that you can edit posts to include an NSFW tag. You can even edit titles after posting! Accidentally leaving out a content warning can be fixed right away by whoever made the post.

Will my beautiful post stay up if I made an honest mistake?

No. Your post will be purged unless it is corrected before a moderator gets to it. Moderators will not wait to make this site safer for its users.