As HuiBui mentions, there are occasions where you get -xx filthiness I avoid cleaners, as you can get it done free if you get a girl in your office and make them clean the place up. Seeing I don't use cleaners because they get paid regardless of slave/non-slave, I can't comment further on his bug.
BUT, I also get -security every week. Again, I've barely used the whore job, but it the limited play I've had, it doesn't impact on the rate of occurrence, ie the only factor is the config rape rates. I'm fine with -2000+ security, any whores don't get raped any more often then the rape % set in config.
Do security girls prevent rapes? I assume they do, but then, guarding gangs, do they also do the same thing? <-These questions = limited playthrough with whore jobs, I'm just curious.
Unsure if both filthiness & security are just not implemented fully yet, or there actually are bugs.