Personally, the biggest problem i have with the game is that you dont really get new options or big challenges. At the slave management core, the game pretty much always plays the same. After 3 days you have a loving/corrupt slave which will never be a problem anymore.
Imagine the game would have too lewd slaves instantly lay down, ass up if they see a strong male enemy in combat. If you could train slaves to becomes human cows, if you could train slaves to becomes rabbid mad dogs in combat, which you then have to hold in a dog pen or on a leash. Or dairy slaves, public breeders and such.
Personally, i would suggest highly tuning down the effect of normal training in terms of falling in love and obidience, while adding more refined options like training, wellness and personal maids for love interests, drugs, impants, mind control, corruption for exploited slaves and so on.
There should be a hierachy of slaves i want to be working on and a buttom of slaves i just exploit to get things done.