stryx: If your company is located within the EU and you are (also) selling to German customers, you'll also have to abide by German law, because the German law is enforcable through EU law.
DanTheKraut: Show me that specific law pls and show me a few shops outside of Germany which really follow the German youth protection law (I can only name 1 which is Ubisoft).
You're looking for "REGULATION (EC) No 864/2007 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL
of 11 July 2007 on the law applicable to non-contractual obligations (Rome II)"
[url=http://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX:32007R0864]http://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX:32007R0864[/url]
Here
http://www.it-recht-kanzlei.de/versand-ins-ausland-anwendung-deutsches-recht-ausrichtung.html you can see how different national laws can affect a web shop selling it's products within the EU.
Especially "Lauterkeitsrecht" in the first part and "Kein Ausschluss anderen zwingenden Rechts" in part two.
The article argues from the point of view of a German web shop, but it works the same the other way around.