I just did a whois lookup, and it appears to me that this domain was used for a similar site to yours but has now shut down. Three possibilities occur to me:
1. Have you ever paid a traffic company for hits? Because a lot of them buy or rent expired domains and put the client's site in a frame in these domains. In other words, if you have paid for traffic, this might be what you have paid for.
2. They may be planning to open another similar site soon and do not want the domain to look closed, so are putting your site on their domain as a temporary stop gap. If that is the case then you are effectively getting what I said in point (1) but not paying for it, so quit moaning and start getting grateful. It is free traffic and the domain is reasonably well ranked so you are lucky.
3. The same scenario as (2) but for a different reason. They may have closed down and run off and have put your site up so it looks like they are still there (kind of the Internet equivalent of shops who put up a notice saying "Closed for refit, reopen next month" then do a runner owing rent etc.). This could be a little more worrying, but I cannot see how you can ever be held accountable for their debts, and their dissatisfied customers will still want a "Russian Girl" type site, so some of them will probably sign up for your site, so you will get a few sales out of this.
Bottom line I spent about a month writing a script that searches out good expired domains, and I spend a lot of money buying them when it finds them. I then put gateway pages to my existing sites on them. This is exactly the same as you got here (except that for SE reasons I don't use frames), but I spend time and money doing it. You got it for free. Now obviously you want to keep an eye on them in case they are going to start doing something dishonest, but until then enjoy the freebie. You are like the guy who moans about all the $50 notes in his wallet taking up too much space.
(A couple of other point occurred to me after I posted this, but rather than edit this post and confuse people who had already read it, I have posted them as new posts after this one.)
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