Hinata wants to have sex, but not like the others, she simply wants to have sex for the sake of it, not to have kids.
In the reversal world womens want to have sex with the scarce mens, but a big reason for it is they want to have kids the natural way, someone that doesn't wish to have kids is abnormal, and Hinata is exactly that.
How do I know? There is a hentai version of this comic set in another parallel world with the same setting, people and stuff, but MC decided to fuck every girl around him after understanding they aren't simply a bit weird and with a foreign common sense but 24/7 in heat, when he got to Hinata she revealed how she doesn't want kids and when they do it she wants a condom (a man asking a woman to use a condom is comparable to insulting her, "I don't want to have kids with someone like you") and she even drinks semen because she likes it (waste of seed).
She is pretty sweet and nice, and knows to be abnormal in that world setting, her thoughts in this chapter make clear is hereditary and possibly her mother is one of the womens that couldn't control herself and assaulted guys.