A device and method for retaining a position of a treatment applicator include a perineal retainer body configured to receive the applicator and form a positive stop with a perineum of a body of a patient, and a locking bracket configured to secure the perineal retainer body to the applicator. The locking bracket is movable between first and second positions with respect to the perineal retainer body, is configured to exert a clamping force to clamp the applicator, includes an actuator configured to move the locking bracket between the first and second positions, and is vertically accessible for securing and adjusting the applicator with respect to the perineal retainer body. The method includes securing a perineal retainer body to the applicator by a locking bracket, and attaching the perineal retainer body to a body of a patient.
