Article: A uniquely Creole tradition is the touloulous. These women wear decorative gowns, gloves, masks and headdresses that cover them completely, making them unrecognisable, even to the colour of their skin. On Friday and Saturday nights of Carnival, touloulou balls are held in so-called universities; in reality, large dance halls that open only at Carnival time. Touloulous get in free, and are even given condoms in the interest of the sexual health of the community. Men attend the balls, but they pay admittance and are not disguised. The touloulous pick their dance partners, who may not refuse. The setup is designed to make it easy for a woman to create a temporary liaison with a man in total anonymity. Undisguised women are not welcomed. By tradition, if such a woman gets up to dance, the orchestra stops playing. Alcohol is served at bars – the disguised women whisper to the men "touloulou thirsty", at which a round of drinks is expected, to be drunk through a straw protect their anonymity.

Question: What are the touloulous' dance partners not allowed to do?
refuse