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Instagram will blur nudes in messages sent to minors
(www.theverge.com)
This is a most excellent place for technology news and articles.
I haven't heard of that law be strictly enforced tho. For one reason - teens are stupid and don't know laws, even though they fall under them. But yeah, most civilized places have laws against production of minor porn that doesn't specify age, but can walk around the problem if it's produced by a consenting party, of themselves, and without a big age difference.
The "problem" here (if you think so) is that if law enforcement in Germany gets to know about a case like this, they cannot choose themselves not to act on it.