I think current skills system is kinda dull, as someone already wrote "you just lose every check until you level up enough and then you just win every check".
Now imagine what could have been instead, different builds with different playstyles, and since this is porn game - sex builds.
For example if there were "charm" and "resist" skills. Charm allows Rowan seduce characters and have sex with them, high charm - Rowan Seducer build. But if you don't invest enough points in resist, then he himself is easily seduced by chars like Jezera, which allows them to manipulate him, and we get sex scenes in sub role - Rowan Sub build. Or invest everything in resist and get moral Rowan, who doesn't have a lot of sex.
Also Alexia could have same skills. And since they are couple, maybe they could share common skill points, so player has to decide: either invest everything in Rowans charm and resist, or maybe in Alexia sex resist, or otherwise she becomes slut, that not able to refuse anyones advances - Cuck Rowan build, while Alexia's seducing skill could allow her to get some useful information for Rowan.
These skill could male/female specific - Gay Lover Rowan build.
Doesn't necessarily means there should be only sex skill, some useful non sex skills alongside could give player some skill points management decisions to make.