This feels like those stupid badly written Disney twist villains. A character who has been good for the majority of the movie suddenly reveals "oh by the way, i'm actually EVIL." It literally comes out of nowhere, no hints, no foreshadowing, no build up. Its just done for the sake of creating a twist but is not earned. This backstory just feels totally out of character.
Your application of morality on this narrative is excessively simplistic, if you can plainly say that Hiroshi was "good" until his history of serial monogamy was published.
You have to not pay attention to how he's been deteriorating since after the baseball game, and you have to forget
the beginning of this manga, which informs us that Kanae is murdered by him and this story is an extended flashback.
Your value judgement of his serial monogamy is also strange. That's hardly "evil"-- it stems from either immaturity or a mental disorder, and it's absolutely hurtful to the women he's with, but he also made it a point to promptly break up with them instead of hurting them more by maintaining a relationship when he's lost all interest. He's even ignorant as to why it repeatedly happens. Presumably, the conclusion of this backstory is the proximate cause of why he doesn't want to have sex willy-nilly.
Let me make this simple for you: Your brain's made up of tiny cells called Neurons... They connect to each other, and they fire in a certain order to do everything from make you hungry, to let you think about your fingers. This applies to your feelings too. If you make the neurons fire the same way a second time, they fire more weakly.
That is in no way how that works. Even worse, "neurons firing" is the tip of the iceberg when one talks about neurological function.
By your logic, are "neurons firing differently" when you brute-force memorization through
repetition? Are subsequent neuron firings weaker than previous ones in this process, even though more repetition creates more persistent memories?
You cannot experience the same emotion repeatedly with the same intensity for the same event
It's not the same event.
Someone can have wildly different responses to either of their parents dying because these are only "the same" in that they involve the death of a parent. But two entirely different people, with sufficiently different relationships to the child, died. They did so at different points in the child's life, in whatever contexts they did, and for whichever reasons they did-- and their deaths by themselves yield different consequences of their own, also experienced and interpreted by the child. The child observing this themselves were in different states of being in both cases.
So If you've had sex with women before, and you've dealt with their drama, among other things, you don't suddenly freak out at the thought of sleeping with one.
Firstly, see above. Not every woman (or anyone, for that matter) yields the same kind of experience, or even an identical kind. There are bound to be commonalities, but individuals-- even monozygotic twins-- are sufficiently different.
Secondly, are you aware that Kanae is a high schooler who prostitutes herself in order to find morsels of comfort because her family and school life sucks, and she herself is mentally disordered? She's presumably very much different than any woman Hiroshi has involved himself with, especially given what we see in this chapter.
Thirdly, I repeat:
The bottom line of this conflict is that he doesn't want to have sex with her at this point in time, she keeps forcing the matter, and he doesn't know how to manage the situation without hurting her in the rejection-- putting aside that she won't accept his conviction, and she won't stop despite his protests.
Does having various sexual experiences also necessarily prepare him for refusing sex? Or is a man "with experience" not supposed to not want to have sex in certain circumstances, too?
All you've been saying is "he shouldn't be freaking out like a virgin" as if the issue is
strictly his familiarity about sexual matters (it isn't) and as if he actually wants to have sex with Kanae in this moment (he doesn't). The reason isn't because he's "freaking out like a virgin", because he's not. His reactions have nothing to do with his virginity or lack thereof--
they are about something else entirely.
You don't understand the neurology you've been trying to tout around. You inappropriately presume without demonstration that everyone's brains operates in a uniform way that supports your thesis. You assume that two encounters of the same type are the exact same just because they're two encounters that can be put in a common category. You preemptively and
shallowly dismiss people alluding to their own personal experiences and observations that contradict your assertion. You've demonstrated that you don't even know that the psychological is necessarily biological and vice versa, and that the psyche exists in the intersection of biology, psychology, and external social factors-- even in a completely naturalistic perspective where it's solely the living brain that produces the "psyche".
Your perspective sounds like that of an extraterrestrial poorly observing humans. It's the product of poorly understood science, edgy hypernaturalism, an inappropriate fixation on sex, a lack of charity for people (and slightly more so women, who you implicitly deny are capable of each producing sufficiently different experiences) and possibly meager base social experience.
