Let me put this in context for you: I have Librarian dot xxx in an auction right now at GoDaddy that ends June 3rd. There is a $500 bid already. What you also need to know about that is that this domain makes sense for selling erotic books and stories (hence the librarian). Plus some adult websites have sections for a "librarian" / "glasses" fetish. Also, this particular domain is the exception -- not the rule. I've got a few hundred single-word .xxx domains. And most of them have not received any offers yet. So unless "Stone" or "Tons" have an adult-themed meaning that I'm not aware of, I would expect less. In fact, if there is no such adult meaning, I would drop these 2 domains and buy a non-adult .com domain or a premium .xxx domain -- one that has an obvious niche -- from someone like myself.