A man walked into a brothel and told the Madam he wanted a woman who had AIDs, HepB, and herpes.
He showed her a wad of money and the Madam told him to go and sit at the bar and she would see what she could do.
Knowing she had only disease free ladies she asked one of the girls to go and entertain the man and to pretend she had the diseases he mentioned.
Well they ended up spending the night together and he made good on his bill.