A device, system and method for improving sexual erectile functions in males that includes an electromyography (EMG) sensor, which is set up in the perineum area over the bulbospongiosus and ischiocavernosus muscles. A cable connects the EMG sensor to an amplifier, the output of which is connected to an analog-to-digital converter. The converter transforms the EMG signal into a form that is accepted by a computer or a smartphone, which contains software that is able to display the EMG signal in a visual-auditory form that can be accepted by the sensory organs of a user. The training of the perineum muscles restricts the blood outflow from the cavernous bodies of a penis and reinforcement of erectile function.