Just a niche, equal demand, or complete replacement?
I don’t see robots taking over the tactile benefits of human skin and orifices,
I don’t think a sex worker would like to have sex with a robot.
Maybe robot sex workers for robots?
The sperminator will wipe out all the pimps.
They’ll have to get far past the uncanny valley first.
You can’t put a round peg in a square hole.
They would use virtual reality instead to titillate the mind. Virtual games do this already.