Web site Life.ru quoted police as saying the 32-year-old man entered the hair salon at about 5 p.m. March 14, brandished a gun and demanded money from workers and customers, The Moscow Times reported Wednesday.
However, the 28-year-old hairdresser, who had martial arts training, disarmed the man and bound him hair-dryer cord.
Police told Life.ru that the woman then allegedly kept the man gagged and handcuffed to a radiator for 48 hours. She is accused of forcing him to take Viagra and forcing him to have sex with her multiple times.
The woman let her prisoner go March 16 and he went to police after seeking treatment for injuries to his genitals.
The Web site said the man filed a complaint asking for the hairdresser to be brought up on charges for "actions of a sexual nature." The woman filed a complaint the next day seeking armed robbery charges against the man.
"I don't know what's going to happen now," Life.ru quoted a police source as saying. "We could put both of them behind bars: him for robbery, her for rape and assault."