And the earlier seasons were quite lewd and violent too.
I mean by lewd it's mostly Fujiko (although she kept some of that sultriness in the latest seasons).
Lupin was quite unhinged, same with Conan's manga with the blood and how violent some murders were (and some rare suggestive moments but mostly innocent implied scenes like one scene when Ran talked about wanting to help Conan washing but since the later is Shinichi, her boyfriend, he got flustered thinking about it which is expected lol).
Perhaps there were new rules regarding shonens about violence and suggestive stuff.
This is why some mangas became more like Seinens like City Hunter.
Early instalment weirdness. Even Conan, Yugioh and I'd say JoJo felt different in their beginnings.