Is it 'lewd' to show your nipple or wear a jockstrap at a gay bar?

Over the weekend city and state enforcement teams inspected four Seattle gay bars. Three of those bars - The Cuff Complex, Neighbors, and The Seattle Eagle - were found to be in violation of “lewd conduct” laws. In a city where nude beaches and jockstrap kickball are acceptable, why is it lewd to work at a bar with your nipple showing?