Вот что узнал. У япошек до самого начала 20 века было нормой для несемейных мужчин влезать в дома молодых женщин и делать детей.

The custom of the night visit, known in Japan as Yobai (夜這い, meaning "night crawling"), was a traditional form of informal courtship where unmarried men silently entered a woman's home after dark. By the morning, he would leave. The girl's family might know about it but pretend they did not.

Охуеть национальные традиции у них.