I have a bit conflicting thoughts about this. On one hand yes, the "let's fuck" option comes a bit too easily: simply talk to them a few times, ask about their day, don't be an ass and you'll get laid on day 3.

But on the other hand, the game is also filled with situations where you make a single wrong comment and the conversation instantly turns to a fight, which ends up in a bloodbath.

I guess these balance each other out. The game is just generally fast with getting to a (quite extreme) conclusion in both ways, and I don't really have a problem with it.