At first I thought her parents were just super strict, maybe some kind of religious types, and were doing the kid a disservice unwittingly, in a manner of speaking, but then came the flashback frame where Amou's mother (I presume) was shown, telling the daughter than she needs to wait until she's old enough. Just look at the mom's face! She's smiling gleefully! Her parents are bloody trolls who were purposefully making their daughter grow up ignorant of all adult matters, probably because they enjoy watching her embarrassed reactions and all that. Damn.