Porn chat automated
(This attitude still survives among some providers.) When public (mostly female) pressure forced the phone companies to stop providing this service to sex workers, a transition was made to a manual method: pre-paid blocks of time, 10, 30, 60 minutes, whatever the customer would pay for.The incentives for providers were then reversed; rather than earning money from keeping the customer on the line (orgasm delayed), they earned more from bringing the caller to orgasm quickly, so as to move on rapidly to another call.
This is the world portrayed in Spike Lee's movie about phone sex, Girl 6.
Unused minutes were rarely usable on a second call.
The provider provided (say) 10 minutes of service, but got to keep all of the money (say 20 minutes).
In the sex industry, similar platforms emerged facilitating the selling of used panties and other odoriferous garments, and for "cam" video sessions, in which the customer, for a fee, can direct the woman on the video screen, and for a higher fee, have a private connection (no one can see caller or provider except each other).
By the end of the 1980s, nearly all of the major local phone companies in the United States, plus the major long distance carriers, were actively involved in the adult chat line business.Details vary significantly from one platform to another, but the provider may be given a personal page on the platform to use however she (sometimes he) wishes.