It means there is a law, and Germany makes a reasonable effort to apply it. Germany asks for Steam to use a different system than "Asking the age to the user" (which in my opinion is hilarious and obviously a joke), Steam decides to not sell the games. (source: https://www.heise.de/en/news/Steam-Payment-providers-force-V...)

It's not like "Germany wants to ban sex games altogether", which seems to be what some other private groups would prefer.