I am stating facts which are, without a doubt, observable.

It sounds like you've given this issue some thought.

That nowadays kids are hardly able to witness sexual and sexual related activities

I don't agree with this observation. I think that thanks to television and computer technology, we're all exposed to sex in ways not possible in the past. As a teenager, I was vaguely aware of the different sex configurations. I knew the basics of monogamous sex and vaguely aware of group sex. Now, you can look at the categories on any porn site like Pornhub, which include mature, ebony, MILF, Asian, Babysitter, French, German, Interracial, threesomes, step fantasy, parody, etc. You can find articles on sex. Fiction stories too. So, unless you live in a repressive regime, you can easily access the menu choices of sexual intimacy. This was not so in the past, as far I'm aware. I know that you're probably talking about seeing sex in the flesh, but I also doubt this assertion. I have to admit that I'm not familiar with Germany's sexual history, so perhaps it was so in your country when the young could see sexual activity around them.

My goal is to re-establish more traditional forms of living together and to revive family-life as something to be proud of, to aim for and to feel pleasure about.

Interestingly, my goal is to develop new form of living together, but I don't want to get into it right now because it involves sex in space