They have Senor Frogs in almost every Mexican town.
Titanic seemed to be the best place for finding girls willing to leave for the night, and I found two Casas De Senoritas where working girls can be found during the day. Unfortunately, these houses didn’t have any names and I doubt I could find them again. But the taxi drivers outside of Senor Frogs in Ixtapa know them and one of the houses is on the way to Puerto Mio from downtown Zihuatanejo had 2-3 really nice girls.