Ethnic joke for the day

Courtesy of my father (being of Welsh descent, he can say these things):

A Scotsman, an Englishman, and an Irishman were drinking together in McSorley's Bar in New York City and having a great time.
"Y'know," said the Scotsman, "I still prefer the pubs back home. In Glasgow there's a wee bar called McTavish's. Now, the landlord there goes out of his way for the locals so much that, after you buy four drinks, he'll buy the fifth for you."
"Well," said the Englishman, "At my favorite pub in London, the Red Lion, the barman there'll buy you your third drink after you buy the first two!"
"Ahhhrr, that's nothing," said the Irishman. "Back home in Dublin is a place called Ryan's. Now, the moment you set foot in the place, they'll buy you a drink, then another, and then all the drinks you like. Then, when you've had enough drinks, they'll take you upstairs and see you get laid. All on the house."
The Englishman and Scotsman immediately scorn the Irishman's claims, but he swears every word is true.
"Wow!" said the Englishman, "This actually happened to you?"
"Not meself, personally, no," said the Irishman, "But it happened to my sister."