Eh, not a fan of dialogue-free chapters, but I was able to mostly follow what was going on in this one.
I like that world custom. Less slutty girls... though maybe slutty milfs.
It's not great because of the false negative rate. Some girls are born without much of a hymen, others break it with vigorous nonsexual physical activity, and still others just don't bleed much the first time if it is done with love and care. And then there's masturbation, of course.