Audio recordings are another avenue for masturbating to an erotic and sexually arousing voice that can provide you with the satisfaction and pleasure you are looking for without having a two way conversation.
Reasons why you would purchase an audio recording:
You are too nervous to make a phone sex call.
The girl in which you are interested in playing with is not available to play when you are?
You need a "silent call" to masturbated because you're not alone and can't talk.