What is the duck in the bar?

A duck in a bar refers to a man who provides sexual services in a bar. It is also called "Cowherd" or "Duck". These men usually provide sexual services as their occupation in order to earn income. In some areas, these men are called "male models" or "young masters" in bars, while customers are called "guests" or "sisters". When providing sexual services, these men usually use some sexy costumes, props and dances to attract customers' attention. Please note that providing sexual services in China is illegal, which may have a negative impact on individuals and society.