Is it just me?

I mean he was straight to be with. It was kinda instinct to do so…

I don't think it's anybody's instinct to cheat no matter the sexuality but maybe that's me

It’s instinct to find your preference attractive. He hasn’t cheated once tho

Nope, looking at other people's bodies in a sexual manner (and I'm saying this cuz it's mentioned he looks at their tits) is not ok if you're in a relationship. What you consider cheating is relative but there are people who do. Also it doesn't matter if you're gay or str8, if you're in a comitted relationship you shouldn't be ogling at other people

Also if he prefers women that much shouldn't be just date them? Why's he making Masato insecure?

Right

Because is implied is kind of a fetish, if you look at official art and the sexy scenes he usually touches and licks Masato's chest a lot too, he has a thing for that body part.
I thing is a tricky subject because I Personally, can't understand the "ogling" since I don't experience sexual attraction, but looking at attractive people even when you are in a relationship is not weird, and as long they don't cross any line I see no problem, I always thought it was a natural instict in other people, but, again I don't know.

No, I mean Masato experiences sexual attraction and doesn't do the same thing so I don't know why it would be considered normal. Also I would consider pointed staring as ogling because it was clearly shown in the extras as to where his gaze was with pointed direction. It's ok if you look at people in general and don't stare at their tits cuz if somebody was staring at my tits I would even consider it as harassment. In general staring at a woman's chest this openly especially when you're in a relationship (with a man who is very clearly insecure at that) is considered rude and vulgar in society because it is obvious that the person is not just appreciating their beauty from an aesthetic point of view but they are staring at the person's chest in a sexual manner which makes many people uncomfortable

Also if it is a sexual fetish then it is even more gross that he does that. I am very sorry but I DO NOT believe in the narrative that a person "can't control their gaze" because that will just lead to slut shaming and misogyny by men saying that they can't control their gaze so women should cover up if they don't want to be looked
( Ik u weren't trying to say that but I'm just clarifying in this comment)

Sorry but that is such a toxic mindset. I also grew up hearing that that is normal. But over the years I learned it is just an excuse from people with no self control or respect for their partners who say that, especially men. And their gfs accept it because that is easier than to address the way their man sees women as sexual objects instead of as people

YESSSS exactlyyyyyyyy