As part of Prostitution in Ancient Greece (https://www.pilloledistoria.it/3189/storia-antica/prostituzione-nellantica-grecia-quartiere-luci-rosse-atene), a key role was played by Etere, which we could be defined as a sort of Escort the letter, distinct from prostitutes who worked in brothels.
The term hetaira it meant literally “mate” and roughly equivalent to our “friend”.
Typically they were slaves owned by a pimp who could give her “borrowed” its customers for long periods of time, officially as dancers and flutists.
Other times these women were instead stamped slaves who performed their job at home, often along with a complacent mother lent itself to act as matchmaker.
One of the most famous courtesans of history is Aspasia, that after many years of living together he could be married by Pericles, from which also he had a son (Photo gives: severus.forumcommunity.net).