YouPorn chat was located at chat.youporn.com.
As a reminder, YouPorn's website is www.youporn.com. Until recently, there was a prominent "Chat" link from the YouPorn website to YouPorn Chat too (which AFAIK didn't disclose that it was run by a different company).
I think people have a legitimate reason to be confused by the line between YouPorn and YouPorn Chat. Until this episode of total incompetence surfaced, I'd say the two firms were quite happy for this line to be as blurry as possible.
YouPorn was clearly making money from this arrangement - otherwise, why allow a different company to piggyback off their high profile brand. It seems only fair that YouPorn's brand now suffer.