Union rules.

A dedicated unionist was attending a convention in Las Vegas and decided to check out the local brothels. When he got to the first one, he asked the Madam, "Is this a union house?""No," she replied, "I'm sorry it isn't."
"Well, if I pay you $100, what cut do the girls get?"
"The house gets $80 and the girls get $20," she answered.
Offended at such unfair dealings, the union man stomped off down the street in search of a more equitable, hopefully unionized shop.
His search continued until finally he reached a brothel where the Madam responded,
"Why yes sir, this is a union house. We observe all union rules."
The man asked, "And, if I pay you $100, what cut do the girls get?"
"The girls get $80 and the house gets $20."
"That's more like it!" the union man said.
He handed the Madam $100, looked around the room, and pointed to a stunningly attractive green-eyed blonde.
"I'd like her," he said.
"I'm sure you would, sir," said the Madam.
Then she gestured to a 92-year old woman in the corner, "but Ethel here has 67 years seniority and according to union rules, she's next."
Rgds,
Crocy.