(a) It's not prostitution, and (b) while prostitution is illegal in the US it's perfectly legal in the UK and many other countries.
https://en.wikipedia.org/wiki/Prostitution_in_the_United_Sta...
(B) Just because the laws do not explicitly mention it does not make it less of a form of prostitution.
(C) Selling your body regardless of the medium is prostitution.
(D) I am looking at it from a moral perspective. Not legal. Let me know if you think selling your body is not prostitution.