A Dominatrix (DOM, Dominatrix) is a sex worker with BDSM specialization in the dominant role. Classic sexual intercourse (GV/AV) is usually not part of the service - instead role play, bondage games, slapping practices, verbal humiliation, breath control, slave training.
Requirements for serious dominatrixes: BDSM training, first aid knowledge, keen observation of the sub's reaction. Studios with professional equipment (cross, cage, bed, torture tools) are standard.