If it was not for the "realtime" aspect of a phone call, phone sex would be as absurd as sex by post !!!! Its not often that I get all fanatical but the only "screwing" aspect is what the phone company is charging you ! get a life......alternely you can phone my " get a life line " on 08............( calls charged at £5 per second via the soloman Isles)
P.s I wonder if the service could be automated like gas /electric ........"hello, thank you for calling xxx, your call is important to us...If you want a wank please press 1, if you want full sex please press 2 etc .......for any other perversion or to report a fault in your equipment please hold ......