Usually nothing. But there are exceptions. Per the Chicago Tribune:
A DeKalb lawyer was suspended for 15 months Thursday for arranging to have a female client perform nude dances for him in exchange for credit on her legal fees, a state commission said.
Here’s how it started:
The relationship began in 2001 at Heartbreakers, a Compton, Ill., strip club where, after Erwin talked to an exotic dancer, both realized they had talked to each other over the telephone about some pending legal matters, according to the commission’s report of the allegations.
You can read more (a bit) here. To read A LOT more, click here (the disciplinary commissions website), then click on the blue “R & D” in the middle of the page, then click on the third item (1/19/07).