I will provide you some tips from my experience,
1. Never ever use flaunt
2. Preferably use taunt
3. And never battle the guards outside of your bedroom (if you always do this, it just make it easier and easier for karryn to get aroused and achieve new fetishes)
4. And max your agility so that you will be able to avoid any kind of attacks (sex attack included except verbal and glares)
5. You should hurry up finish the game lol, the longer you play the game it will be the same as making karryn to get more hornier
6. Try to keep your slut level to be as low as possible (The lower your slut level is, the higher your charm will be. It can unlocks items that will help you to achieve pure virgin ending when you completes each stage)
7. Dont do bar and toilet minigames lol
8. If you do a lot and a lot of battles it will increase your masochist level and it will add the fetishes too (so please dont forget about point 5)
9. Don't lose any battles (especially boss battles)
10. Max either halberd offense or halberd defence
11. Learn stances (defensive and counter is enough)
12. Dont forget to increase the uniform resistance too (a lot of dodging can make your uniform loose)
If anyone want to add more or maybe have any more question you can ask me
I don't agree on the 'not fight guards' thing. Just don't 'grind' the gaurds (meaning spend days waiting for your order to go down and just killing the guards to make more cash, just stick with the regular pace of the game and it should be fine. Regular pace being max level = time for bossfight, and in that case leveling up on just the guards on the first floor is probably better than fighting criminals for exp, since they give order and you don't want that). You can use the guards on the first 20-ish days w/o worry to just quickly level up and make some extra cash, just optimize making cash and buying edicts for combat. The point being that all enemies get stronger day after day (including the guards), and you want to avoid them getting too strong to one-shot or to be baited w/ taunts in counters because they avoid it. Stances aren't required either. What you want to do is optimize Strength, taunt your enemies in situations where you're facing 5+ enemies (less is a waste due to sadism exp, get a Agility/Dexterity move to deal with multiple enemies and limit it's use, use it on 'nerds' and 'the ninja guys', because they have 'tricks' that affect your ability to fight back, the horny needles and the tackle that trips you to the floor. Limit those moves becuase of the exp boosts, you want to focus on STRENGTH). Also you can make a decent amount of extra Order with the Receptionist job for a long time w/o much risk if you avoid the freaking goblin. Get the 'mind restore skill' (wish something something if not mistaken) and get Endurance to I think it's level 3, so you can get the 2 stamina boosts on level up.
If you do it right you get lots of stamina, endurance, mind, and the neccesary strength to one-shot most things.
Also, don't get sadism up. So minimize taunts, don't cock kick, don't stare cock. Sadism will eventually give you pleasure for attacks, and that basicly stacks faster than being groped if you are playing a purist (who gets barely groped unless most enemies are down in later waves). Being to trigger happy on the taunt is gonna stab you in the back in the late game, but you can allways use your hands/mouth on the level4 boss if you at this point starts struggling. If you do most of the above right it probably won't be that big of a problem. Just make sure to save scum each floor to get a clean save, and you'll eventually get the boring part out of the way (the purist "round").
Another great tip is... play on secretary mode first, get the virgin and the other one (forgot the name), then you get the hardest to get unlockable. After that, it's Warden time and you can play the game w/o worry of getting duplicate savepaths down the road.