That title is a LIE... first, she's not the one getting cucked. Second, it's very far from easily, too. You have to voluntarily prostitute her 10(!!!) times, for her to consider cheating, or to lose 3 times when the public danger is high. The thing is - it's not high if you don't steal anything from people and just be a normal adventurer. And even if it's high, the guys trying to harass her and you are pathetic, and will fold easily.
And EVEN IF, in theory, you get 15 public danger on the low level, you can just press escape and avoid any fight with them. You might think NPCs might harass her, then, and you're right... if you made her wear the bikini, that is. And just grope her a bit. Otherwise, she's fine.
What a nice adventure that is. With only a bit of game-breaking bugs, but they can be circumvented.