Enter a paradigm shift: The Mistress/Provider Timeshare!
Actually, I think this is an idea that's long overdue. Seems to me at least for many providers and hobbyists such an arrangement might be an excellent arrangement.
Providers might offer annual subscriptions to a relatively small circle of known, safe admirers. A subscription would entitle a "member" (pun intended) to some increment of consultations (monthly, weekly... daily or whatever), perhaps at varying service levels. Subscriptions could be pre-paid on a monthly or yearly basis, creating a reliable cash flow for the provider.
Obviously, there are endless variations possible that would create a different kind of service delivery system that could convincingly sidestep the legal hazards of government intrusions into the private decisions of consenting adults - as long as the taxes get paid.[/b]