How would he react if I fantasised about Pauline in a bikini?
Side note - You are not me, Hiro-san, and neither is Pauline, but, if I had a girlfriend, I wouldn't make it an issue if she talked with her friends about guys she thinks are cute or whatever or she had magazines or posters of shirtless men like Enrique Iglesias, Ricky Martin, or even Fabio (who is my inspiration, which is a reason why my hair is long and flowing). I have a problem with it if she obsesses.
In my society, some girls/boys feel bad when their partner even lets one slip of a brief staring at another attractive opposite effectively end the relationship.