I think they're having sex-education lessons thats why they separated them. Im in America and they separated us in middle school whenever they taught us about those stuff so i dont think its just in japan...
Ohhh wait...i misinterpreted your question xDD i was reading this long book and your words were all jumbled up in my head. I wanted to try and help out quickly but i guess i failed! sorry!!!
I live in Ohio and for the most part sex ed is co-ed. We even learn about emotional aspects of it, and read different stories on the perspective a girl getting raped and her boyfriend not thinking what he did was rape and vise versa. Technically we learn everything about sex in relationships and the effects on others
Didn't you just wind up hearing all about it from your friends anyway? Seems pointless to try to put the cat in the box when it's already free. What's the point of your parents excluding you from your peer group?
Yeah... That's about right, but honestly I was always the naive kid who had their head in the clouds. I must have hung out with some of the worst pervs and druggies in school, but never understood anything really until sometime after I graduated.... I think cause there was an issue with my half brother when I was growing up, most of my friends really sheltered me. I'll tell you though that even knowing everything and all the stuff I've seen and read, they are still the best friends I could have asked for.
http://www.mangago.zone/read-manga/nennen_saisai/mh/c002/7/
It's the second manga I see that. So in Japan boys and girls don't have sex explanation together?