The Bill on its face is totally Unconstitutional, and a federal judge would swat it down in a nano-second like one does with a fly swatter to a unwanted fly, about to land on your dinner plate. Consenting adults of whatever gender, mix and match, can F in private settings with impunity, in whatever orifice they want. Isn't the Fruited Plain just the best? Next!
Prostitution is still illegal in most states, so that's not quite true.
Prostitution involves a meretricious relationship. In this case, the two adults are "putting out" for free. It ain't prostitution.