So a naked woman walks into a bar and asks for a beer...

The bartender stares at her body from head to toe then serves she a beer. She drinks it and asks for another beer. The bartender stares at her for longer and serves she a second beer. The woman again drinks it and asks for a third beer.

Then the bartender starts to look at her with an amused expression, until the woman says:

-- What, have you never seen a naked woman before?

-- That I have, miss. I'm wondering where you're keeping the money to pay for the beers.