With a bit of planning ...
If you don't mind a little pre-work, you can find girls on [url]www.sentimente.ro[/url] - it's a free account, put in some personal data (there's an English version), try working the search engine, and maybe instead of looking for the obvious "girls wanting sex", look also at those wanting short term relationships. It has a messaging system.
Also try random instant messages to girls you like the look or sound of - you often get a response.
Note - the instant message service is clunky and may be blocked by a pop-up blocker - so check your browser settings.