A Union Rep attends a convention in Las Vegas.  While there, he decides to sample what stays in Vegas.  So he goes to a house of ill repute and asks: "How much does the girl get and how much does the house get?"
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"The girl gets 10 and the house gets 90", came the answer from the madam at the door.
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"That's no good", he grumbles, and trudges off indignantly to another house.
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Next house, same thing.  A third house, same thing.  About to give up, he tries a fourth house.
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The madam says: "We're a union house.  The girl gets 90 and the house gets 10"
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"This is my kind of place", smiled the Union Rep.  "I'll take that pretty young blonde sitting right over there" he tells the madam.
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"No sir, you'll take this 65 year-old toothless granny over here.  She has seniority!"