1. Talking dirty over the telephone for pleasure or arousal. Synonym: ear sex.
QUOTE: From PHONE SEX - THE FAQ: ' A telephone conversation between two or more people whose object is to arouse, titillate and stimulate the caller or callers, hopefully to the point of orgasm. Some have described phone sex as guided masturbation fantasy.'
2. To call a number, as advertised in newspapers and magazines, to talk explicitly or lewdly about sex with a woman. Customers pay by credit card.
QUOTE: Charles Panati. Sexy Origins and Intimate Things (1998): ' In 1996, Americans spent between $750 million and $1 billion on telephone sex.'