Phone sex is a type of virtual sex that refers to sexually explicit conversation between two or more persons via telephone, especially when at least one of the participants masturbates or engages in sexual fantasy. Phone sex conversation may take many forms, including : guided, sexual sounds, narrated, and enacted suggestions; sexual anecdotes and confessions; candid expression of sexual feelings or love; discussion of very personal and sensitive sexual topics; or just two people listening to each other masturbate.
Phone sex exists both in the context of intimate relationships , and as a commercial transaction between a paying customer and a paid professional.
A phone sex worker is a type of sex worker and pornographic actor, sometimes referred to as "phone actor", "fantasy artist", "adult phone entertainer", "audio erotic performer", or any one of other monikers. The most valued attributes of a phone sex professional are his or her voice, acting and/or sexual roleplay skills, along with the experienced ability to discern and respond appropriately to a broad spectrum of customer requests.
Wikipedia, Phone sex, http://en.wikipedia.org/wiki/Phone_sex (as of Apr 1, 2010)