"Partial Nudity" inceases lust, and stress if the slave is not sufficiently sexually experienced or perverted, at the end of the day.
"Enforced Silence" stops low obedience slaves from instigating other slaves to be less obedient to you, and it reduces courage to a medium-low level.
"No Masturbation" prevents slaves in personal bedrooms from reducing their own lust. It can eventually lead to the slave acquiring the "sex-crazed" trait if the slave has a source of lust and does not have any sex.
"Pet Behavior" reduces confidence and charm to fairly low levels.