Yeah that is definitley up there. I remember a line in that story by one of the Supes about cousins being able to marry on Krypton. Maybe it was less of a big deal in the silver age?
Some non-sexual icky moments would be the whole concept of Batman & Robin. Wealthy guy brings his underaged ward into really dangerous situations.
Than there's Marvel's Power Man who volunteered to be experimented on in prison. The guy doing these dangerous experiments is looked at as one of the good guys!
And how about Ronnie Raymond Firestorm, who's origon basically starts out with him being a terrorist when he goes along with a crowd to blow up a nuclear power plant. Even pre-9/11 this seemed really wrong.
