Since Charm and manipulate are extremely bad in the early game and 99.9% of attempts fail, what do you guys do with slaves anyway? Can't intimidate or terrorize, can't explain, and you won't succeed at sex or BDSM rolls either.
So what's the common plan here, put them to work at the book store?
I don't do much of anything with the girls other than train stamina until I've fully upgraded the bedroom, the living room, and the bathroom. That gives you a huge passive bonus to persuasion and an extremely easy way to generate some arousal in a girl before you try to do seduction/ask for sex/bondage.
It also helps a lot to cycle each girl through enough combat to build her respect to 20. You can go higher but the respect gains slow down dramatically after 20 so I usually stop there and move on to the next girl.
Ironically, it's actually easier to just ask for sex (better success rate) than it is to try to seduce them first. It doesn't build as much happiness but it's quicker and you'll succeed more often. Just take a bath with her and then ask for sex and you're good. That will grind up your manipulate skills as well.
Seduction is where you can grind up charm via caress, although I get most of it by just buying it up at the hospital when I have some money. Just do caress til your charm reaches a number ending in 4 or 9 and then buy it up to 89. Do that before you read the persuasion books. Seduction is also the place to work on bondage, kissing, and cunnilingus skills.
For bondage and flagellation your best bet is to go whip the girls at dockgraves frequently. That's a very effective way to raise bondage and more importantly flagellation. I've found that whipping is counter productive until you get your flagellation skill up so the only thing I use bondage for until then is to fuck a girl in the ass for the first time. If you picked the big dick option most of them will refuse to let you fuck them in the ass until after you've done it at least once during a bondage session.
Once you get a girl to loving or better affection she'll also be willing to do almost anything even with relatively low stats. So your success rate at most sex related things will go up.