"http://www.domainnamesystems.com/
"Alternate Registry of the .xxx and .sex domains."
http://www2.domainnamesystems.com/xxx/info.html
since .sex does not exist and is not on the list of ssTLDs proposed to ICANN, this is highly likely to be a scam."
I had a domain with DomainNameSystems.com, and it happened to disappear from my list when I'd log in and now is registered by someone else; it wasn't up for expirey.
Someone else on another board recently posted about someone stealing his domain, and sounded as if it was same way.
Perhaps they have a bug or a hacker, but if they're offering pre-registrations for $80 ... I imagine they'll accept 10,000+ pre-registrations each for hardcore.xxx free.xxx sex.xxx etc... if that many people fell into it.
Mat