Phone sex is an erotic conversation between two or more people by means of the telephone which is sexually explicit and is intended to provoke sexual arousal in one or more participants. As a practice between individuals temporarily separated, it is as old as dial telephones, on which no operator could eavesdrop. In the later 20th century businesses emerged offering, for a fee, sexual conversations with a phone sex worker.
Phone sex takes imagination on both individuals' part, as each party imagines virtual sex. The sexually explicit conversation takes place between two or more persons via telephone, especially when at least one of the participants either masturbates or engages in sexual fantasy.