...even [Brent] Wilkes drew a line on what he would do for the congressman. For one thing, Wilkes was totally disgusted by the hot tub Cunningham put on the boat's deck during the autumn and winter. What repelled Wilkes -- and others invited to the parties -- was both the water Cunningham put in the hot tub and the congressman's penchant for using it while naked, even if everybody else at the party was clothed. Cunningham used water siphoned directly from the polluted Potomac River and never changed it out during the season. "Wilkes thought it was unbelievably dirty and joked if you got in there it would leave a dark water line on your chest," said one person familiar with the parties. "The water was so gross that very few people were willing to get into the hot tub other than Duke and his paramour." That was a reference to Cunningham's most frequently seen girlfriend, a flight attendant who lived in Maryland.