are at. >> call girls like alexis don't give up their precise location for two reasons. one it ensures the john is close and ready to make the deal and gives pimps or women time to check them out. >> room 327. she is launching out the window. she saw me pull in. 327. >> dan signals a deal for sex has been made. alexis offered oral sex and intercourse in exchange for $250. >> danny. we're coming in. >> officers quickly i.d. alexis as 21-year-old chanel velasquez from california. >> you were on back page, right? you posted yourself? >> yes, sir. >> internet back page makes it possible for this college student to sell herself 2,000 miles from home.