It's entirely fair to call this story's main characters Dr. Rollins and Dr. Warren "mad scientists." One invented healthy cigarettes, and the other enhances anal sex surgically. If smoking or butt sex bother you at all, please read something else.
Club Dancing was a demanding skill, that would take time and training. And training cost money; so while Janet was serving her apprenticeship, she would need to pay for her keep; by providing a well paid service on the side? Alf Matlock said the demand for BDSM service was always there and paid handsomely; and penetration of the girl wasn’t always necessary; it could be a sadistic bondage role on a client by an erotically dressed Janet; could she provide that Alfie had asked of her father?