the prostitute joke

Once there was this guy from Glasgow who took a vacation to Aberdeen. While there, he met up with a prostitute. He got down & dirty with her. Afterwards, the prostitute said: "£100 pounds." The guy said: "No, here is £200." The prostitute responded: "You're so kind." Some days pass, and the guy met up with the same prostitute again and had sex again. The prostitute asked for £100, but the guy again says: "No, here's £200." The prostitute says: "You're so kind." More days pass, and the guy met up with the prostitute one last time to have sex. The prostitute says: "£100, please." The guy slaps her and hands her £200. The prostitute says: " you're so kind. Where are you from?" Guy says: "I'm from Glasgow." The prostitute says: "I am from there too." The guy says: "I know, your mum sent me to give you £600."