Spammer at FamilyCaregiver.info working on my last nerve

I went out to FamilyCaregiver.info last night and was looking around on it. out of the three people that had signed up since I was last there, only one was actually a legitimate caregiver. One was questionable on what they were, and the other one was very obviously that same spammer I had kicked off three times before.

Why the guy is picking on that site I have no idea, but he is starting to get on my last nerve. He's a persistent cuss that just wants to post a long post of links to porn sites.

I have the site set up so that only caregivers can comment, and you have to have me manually set your status to being a caregiver. I don't like that, would rather allow people to comment simply by registering, but that prick is determined to hit the site with as much porn as possible so I can't do that. He just re-registers and I have not yet found how to block his ISP.