It's not what you think. In fact, it turns out that Indian sex workers are positively opposed to dirt.

The tradition of collecting earth from brothel areas by sculptors to be mixed in the clay used for making images of Goddess Durga hasbeen opposed by sex workers here. "Sex workers who are our members as well as others have turned against this practice, which makes them feel stigmatised." said Dr Smarajit Jana, chief adviser of Durbar Mahila Samanya Committee (DBMS), the apex NGO of sex workers. As per the belief, the client of a sex worker leaves behind all virtues and takes only sins inside when he enters a brothel. So the soil outside is full of virtue and fit for use in making images of Durga... Speaking out against the tradition, former secretary of Durbar and a sex worker, Swapna Gayen said, "This practice will not help in changing the attitude of society towards us. So why should we allow this?

It puts a whole new meaning to the saying about "dishing dirt" on someone.