Phone sex is a conversation between two or more people on the phone where one or more of the individuals is describing the act of sex.
Phone sex takes imagination on both parties' part; virtual sex is difficult if the operator does not put the images in the head of the caller and the caller must be open to the pleasure as well.
Leonard recorded her own voice informing callers of the contents of the next issue of High Society magazine before its publication.
Later she recorded others such as Annie Sprinkle "talking sexy".
Once means of transmitting payment were developed, phone sex turned into primarily a commercial activity, with customers (overwhelmingly male) and sellers (overwhelmingly female).