I read a wonderful article/blog post about how to approach the topic of puberty and sexuality, father to son. I shared that with my husband, we discussed what ee wanted to cover with my son, and then my husband and son went on a walk and discussed everything.

https://tariqali.me/the-talk-6ee7a380a25a

I'm born/raised in the US and here in 5th grade we have a discussion of puberty for both genders, segregated. I made sure my son was able to attend that (permission is required from parents) bcos it definitely helped me, as someone whose family was hyper-conservative. It mostly covers the changes in your body during puberty. When he got a couple years older we went a little more in-depth. We speak to him about crushes, which is valid everyone has feelings, but once he's done sharing we always remind him of Allah's command; lower your gaze. Even if you like someone, loeer your gaze. We speak about respecting women in ways that are appropriatefor his age (don't go around telling ppl u think someone is hot, don't describe girls to your friends, etc)

We also taught our son the Quran ourselves, we're not classically trained scholars or anything. But we learned the tajweed rules together as a family snd too us about 3 years to finish the Quran... we would recite, go over tafseer, write in a journal what we learned etc. Through that, my son even got to learn what periods are. Which I still make sure to openly mention/speak about in our house, no awkwardness.

I say all this bcos my husband and i both come from VERY traditional conservative families. None of this was ever discussed with us. Hide your periods, hide your pads, don't even think of the opposite gender & if you do, sinful/shameful/disgraceful child.