In the presence of such a beautiful woman, at the very least the slave should have a conspicuous erection. My wife demands that I always stand at her feet bare and with a hard cock. It is a non-verbal form of declaring admiration for the mistress, and indirectly admitting one's inferiority. My wife (the dominant woman in general) has a better experience humiliating a man or torturing him in the genitals while his cock is very hard.