Sexual exploitation

It didn't occur to me until afterwards, but the part where they are bored at the nightclub and decide to call in some of the good looking labourers.

They're really just objectifying them, and we don't know what is in the guys heads, maybe they feel forced to do this or else they can't get a job with them again.

You could say the girls are using the guys not only for the cheap labour (illegally renting them out and not paying tax, and thus having no insurance for them), but also using them for sex as they call them at their leisure and there is a definitive power factor the women have over them being their employers.

It would have been easier to see if they had been men deciding to call in some of their foreign women workers.