[CutiePie2000]

A call girl is essentially a prostitute, i.e. a woman who gets paid to perform sexual acts, although my understanding is a call girl is a "high class" one. (i.e. there's slight differences along the prostitution spectrum)

To me, "hookers" stand on the street corner and could feasibly go with ANYONE [which is extremely dangerous], whereas call girls will service business men in their hotel rooms, the business man's homes, etc. (i.e. Out Call Service) Essentially, call girls are much more discriminating about who their customers are and they can afford to be, as they are a bit nicer groomed, well spoken, etc

(I read "The Mayflower Madam" by Sydney Biddle Barrows and it was quite interesting).

If she wants to "party" with you, that's a euphemism that she wants to do sexual things for you and have you pay her money for her to do so.
The End.