I guess its the same as theater and a motion picture. In theater you are paid for each presentation. In a motion picture you are paid to do it once and then pai

I guess its the same as theater and a motion picture. In theater you are paid for each presentation. In a motion picture you are paid to do it once and then paid royalties (if in contract) for each showing. Meaning that a porn actor is trying to leverage that one act into more money and a prostitute must increase the amount of acts to increase the cashflow.