if I were you I'd stay clear of La Rambla.
Nexus point for all sorts of crime against tourists.
If you don't know the city there is a high probability you are going to get ripped off (possibly worse). A few spectacularly dodgy areas a mere street or two off the main drag. You do not want to be on your own there (esp. late at night/early morning).
Just my opinion but LR is vastly over-rated (and ovrr priced).
For street girls maybe try streets around La Barceloneta.
Alternatively a little research on Google would provide you with alternatives like this
https://okescorts.com/en/natalia-escort-barcelona/Happy hunting.
Bona sort!