Tools tab, antispam subtab. Filter for "sex" and click the green checkmark next to the blacklisted term. BTW did it actually block "sex" or did it block "-sex." which is what I think shows up in the keyword list?

THANK YOU! Now, why couldn't the error link direct you to that page instead? :)

You know, thinking back, I think it was -sex, but I just thought that it put a - before the word for the heck of it, LOL. What is the purpose of the - ? Do spammers always use those or something?

ETA: Interesting. The text says

Any URL containing one of the following keywords will be banned from posts, comments and logs.

If a keyword restricts legitimate domains, click on the green tick to stop banning with this keyword.

But it doesn't do just URLs, it does ALL text.

Dunno why it doesn't link to it. I'm quite happy that it finally tells you the bad word that blocked the post and would actually prefer it to allow me to bypass the filter, but that's ... I dunno what that is.

The purpose of the - is to NOT block the reasonably normal word "sex" but still block lots of spammy domains. Like hot-sex.whatever and so on and so forth. Generally speaking, words are just words. The keyword list was (initially primarily) designed to block spammers from promoting their junk in your comments, and has also always been applied to new post content. This would stop someone from registering, getting permission to post, then posting links to 'bad' sites even without bad intentions. Figure it this way: why should a blogger on your system give ANY link-love to a spam site even if it is not intentional? And that should pretty much address the edit portion yah?

BTW -sex. blocks HUNDREDS of spammy domain names. Nowhere near as many as .blogspot.com blocks, but still - literally - hundreds of reported domains are blocked by that one keyword. Leading and trailing punctuation helps minimize the risk of blocking normal natural text yah? Obviously it can happen, but the choice between hundreds of extra keywords or the very rare blockage of legitimate text was pretty easy ;)

EDIT: Oh yeah it is a text filter in reality to capture the spammer who tries to get around the method by typing a comment that says something like "Thank you and you should visit my site at hot-sex.whatever.com" - which MIGHT get them traffic from someone who copy/pastes the text OR a search engine that indexes it.

That all makes sense, thanks.

I must have had a typo when I first tried to post, because----ah, wait. I had typed something like "blah blah blah---sex after dinner---blah blah blah" so my dashes are what did it.

I will go put the -sex back now, since I can get away from using it in between dashes to hopefully save on spammings. :)