Return to fuck is a term commonly used by people who engage in sex with sex workers. The term is most often used on online commenting forums. If a person says they plan to "return to fuck," they mean that they intend to return to a prostitute for another sexual transaction.
Return to fuck is often shortened to the acronym RTF.
More About Return to Fuck (RTF)
Return to fuck is typically used to show that a particular prostitute is good at their job. For example, a client may write that they will return to fuck because they received an amazing orgasm with the prostitute. If one person writes that they will return to fuck, others may be encouraged to book a session with that particular prostitute.