It is an incredibly common thing among Catholics, and other religious groups (even knew a Jewish girl who felt the same way about it), to them, all that matters is that their hymen remains in tact, because that is what a 'girl's value' based on to many people (despite the fact that many women are born without one, and many others break them in other ways, like through exercise or accidents, never mind masturbation)... They even wrote songs about it, it is so common, my favorite being
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Religions that have rules about sex, tend to value women only for their 'purity' and their ability to make babies, and this is clearly one of those. I am positive that Autumn is that kind of girl (and maybe Hazel too), she will hold on to her hymen for a long as possible. Odds are, that will be the very last thing we unlock with her, we should even have her in the dungeon before we take her actual virginity.