Must be a Cha check, you get a high sex score pretty easily just by "training" your girls but I haven't really played with a high-Cha character. Maybe I'll try a gigolo playthrough and just let my minions fight all my battles...
Rule of thumb of RPGs:
PC always should have high CHA.
In Strive I, it was a bit harder at first to stay alive, but in here, since it's still on development, it's much easier.
You can take the "Curious" sex skill at start, it gives regular extra XP per sex (aside of sex xp), easier to level up (and if you find a peon/slave with the "teacher" skill, then both will benefit by having sex)
You already start with some magic skills, so you can go for high CHA and phys, and take a slutty class (just leave MAG at 2, in case you want a magical class later)
Harlot has a "Distract" skill which is pretty useful (lowers hit and evade on an opponent), the "Pet" class has "reward" skills, meaning you can serve up to 3-4 peons/slaves aside of regular interactions, and get their loyalty/obedience to the roof, plus gain lots of xp.
You could keep going for slutty classes, but they all have similar skills, so you could take the "attendant" class, which gives a healing and a free use of an item.
All this lets you level up relatively fast, as well as keeping your guys/gals doing most of the work, witout having to rely on magic or combat yourself.
(besides, is pretty much impossible to die in a dungeon. Use the "turn" option instead of running time, and once you're dungeoning, after a difficult battle, just click mansion -do not return the party- and "end turn", basically rest for 1-2 hours, and get healed as much as you want. Then you can click back on the dungeon and keep going. Tricky but still not a cheat lol)