Will curiosity kill the Kat?... Just kidding
Well, I just don't think it fits the personality I've molded for the character.
I mean, if I just wanted to watch porn I could go to any of the millions of sites on the internet, but in a game I'm looking for something else (a very popular discussion topic on the forum) and luckily this game provides me with an attractive story and enough freedom to choose the path I want the protagonist to follow.
The Stalker can be anything, from a lusty sadist to a heroic idealist, and let's just say that the choices I've made so far in the story lead me more in the latter direction. Having sexual relations with his niece is outside of the previously established moral principles, which takes me out of the story and creates disaffection towards the main character.
That's why I say that I don't mind waiting until the problem is resolved, in order to maintain the consistency shown so far.
I hope I have satisfied your curiosity.