I mean are you using prostitution to mean "pro-stituere" ("ready" "to be sold") in which case even the most ardent captialist would agree. Or are you making an insinuation that exchanging the brane of labor-time-effort for the brane of exchange-account-value-store is somehow immoral? Because even the most barter-focussed kibbutz or shetl will eventually need to trade some kind of future (e.g. fishermen need boats before they can provide fish, farmers need to survive the winter to sow seeds in spring)