brothel monkey
A person who regularly frequents brothels and is well known by the people who work there, so much so he/she has a "usual".
Whore 1: You see that guy, he's such a brothel monkey
Whore 2: I know! But he's pays well, he's single-handledy putting my kids through college
Whore 2: I know! But he's pays well, he's single-handledy putting my kids through college