1. Waiting for sex scenes is just a bad midset - it leads to frustration. Frustration leads to Anger, Anger leads to Violance and Violance is a path of the Dark Side ...
But seriously - it is wrong becouse it makes it feel like that 1 sex scenes is end goal of the game - and I god hope it is not. Sex scenes should be just parts of the overall story not a reward or checkpoint because that makes it feel gamey and stupid.
2. As for your second point here - about filthy route beeing not filthy enough.
I told this to developer at the begining that the whole split into Good Wife / Bad Wife just doesnt work. The routes are only ilusionary btw, as there is no branching of the storyline at all.
It is more like one route when you can eighter play it right - and collect Filthy points, or fail at playing the game and chose Good wife choices - that makes you skip 2/3 of the events.
So yeah - IMO there is no Filthy Wife route. There is single Route in the game that can be played more or less successfull ...