Prostitution is the tip of the iceberg of a conception of the relations between the individual body and the body politic. Rights over the body have been alienated by political power without any explanation or contract in this regard.
This explains, for example, why some governments feel legitimate to exploit women's bodies as producers of life. And the same thing happens with death and in the way in which some doctors can exercise corporate, union or class rights to decide how other people die. Of course, sex is not essential to control the body. The preferred tool of power is work.