So we had the "trends in behavior amongst children who've been subject to domestic violence" in chapter 2 and missing hymen now. This is more than foreshadowing
Most women have the majority of their hymenal tissue worn away by adolescence.
Wait, really? Is that true? But it's flesh, won't it renew itself?
It's actually a membrane rather than muscle. It doesn't regenerate, and some girls don't have one in the first place.
Fun fact: hymen are membranes like nez said, but more often than not it's just a membrane that is narrower than the rest of the vagina. Besides that there are a few other different sorts of hymen, and there are even cases where the hymen completely closes off the entrace and must be removed surgically once the girls starts menstruating. And hymens don't break. They can stretch, but is often suddenly overstreched which can result in tearing, and a bit of bleeding.
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