What is a rap parlor?

Mainly a slang term from the 1970's, referring to a prostitution house.

Definition

Generally a slang term used in the USA, most specifically New York, as meaning a brothel, or prostitution house.

Place to have sex, for a fee.

Noteworthy: Chicken Ranch is a mythical establishment from a Hollywood movie, The Best Little Whorehouse in Texas. Mustang Ranch was an actual legal prostitution house, facility, in Nevada.