Damn, didn't know German have region lock for lewd games, always thought German was more sensitive with "Violence and WW2 history". Since I remember Germany used to make alot of Lewd games, like Lula Virtual Babe in the 90's. I think China are allowed to buy lewd games, but not allowed to make lewd games with full frontal nudity and segs. This is why alot of Chinese games tend to be on Scandily clad females but no actual lewd situation. Although alot of lewd games have Simple Chinese, so I assume they have lewd games.
the games arent actually forbidden. nobody is forcing valve to block them for german users. that's their own decision because they dont wanna bother with reliable age verification.
the funny part is: if u get keys for lewd games like from indiegala or elsewhere, u can still redeem them on steam as german user and play em.just the shop and community pages are locked for german users.