Porn sponsors & adult affiliate programs
Sponsors (or affiliate programs) are the heart of the adult business.
You sign up to a sponsor with your personal information, choosing a login/password, and get a set of linkcodes.
You send traffic to their paysites or galleries through those linkcodes and when surfers pay for a membership and you get paid ~$30 per signup or 50% revshare (meaning 50% of all recurring billings to that surfer).