Most TV shows and movies have sex scenes. The people having sex are always very average looking. Sex scenes are usually not sexy or romantic but just chaotic and awkward, and very every-day-lifey. Like a middle aged couple having sex in the bedroom and their 5 year old kid opens the door and one of them is chocked and falls out of the bed and breaks a finger. They have to drive to the emergency room and so on, and next scene they enjoy a meal together at home in complete and awkward silence. And a finger in a cast is there as a reminder of the incident.
This could be a scene in any TV show airing at 20.00 on public service TV. There's also a lot of nudity without it being sexualized. Like people in saunas or women breastfeeding. Normal every day stuff.
For examples check out Love & Anarchy on Netflix, great show with only one short season. Or Bonus Family also on Netflix.
Sex education is also a thing. You are taught that of course you should have sex because it's great and fun etc. and here's how to do it safely. Oh and now class, we are going to watch a 1 hour long sex tape with two normal people having sex in a loving way. That was an awkward class to attend. And next class, practicing putting on condoms on dildos, so we all know how to do it. Imagine being 13 and sitting next to some cute girl in your class and having to practice putting on condoms!
Compared to other parts of the world where sex and nudity is banned and censored, which is of course ridiculous if you want sexually healthy citizens. If you can only see sex through porn, with smoking hot models, I'm sure it messes with your young mind.