On a different site I saw a bunch of comments on ch 2 about Japanese women being taught they're slutty because they have dominant sex so I'll say this and its different for everyone this is just my experience
We were mostly taught that sex or indecent acts before marriage or before a certain age is scandalous and could ruin your reputation with rumors in the future for work opportunities or getting married well or sumn
Though it's not the same for everyone is pretty common that most kids especially older ones would know this by the back of their hand "don't do this or you'll be seen as indecent and can never get married well and support the family be submissive so you don't get in trouble(๑•ㅂ•)و✧" stuff like that
It's pretty stupid since the legal age of consent is around 13-16 so idk why we get taught this or at least i was until i moved to the states ╮( ̄▽ ̄)╭
(Im a quarter Japanese lived in Japan until i was 7)