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Prostitution might not even be a uniquely human phenomenon.
There's also a question of what, exactly defines prostitution. It's straightforward enough when it's a one-time transaction, but what to make of a relationship where one party provides regular sex in exchange for food and a place to stay (a paleo sugar daddy)?
Sounds like one idea of traditional marriage. The woman promises to provide sex and the man promises to provide. Some feminists (e.g. Germaine Greer) have described this arrangement as prostitution.