Let's start with specific questions. Is there any violence in comics? Definitely, yes! Is there any sexuality in comics? Well, this based on your definition of sexuality, but I can still give you a yes. Is there any dirty dictions in comics? Oh yes. So, what are you thinking? Close your Windows 95 right now and throw away all your boy's comics? Calm down! You better understand what your enemy is before taking any action!
First, you better understand that COMICS IS NOT FOR KIDS ONLY! Even in terms of American superhero comics, things are no longer the same. Probably being influenced by the manga (Japanese comics) and for the market selling, most superheros are not a perfect man like Superman at all. These new heros have emotions, like everyone of us. They make mistakes, they regret, and they probably do something bad. To children, I would say these comics may provide a bad influence--that makes children be aware of the cruel true world too early. Then, what should we do if your child read these comics? We all know that prohibition is not a good way. So what?
An important thing for you to do, is to tell them the good values from these heros. Since the heros are more human than ever and more like you and me, it's a good method to let the child see the heros as idols who make mistakes. "Belike Bumble-Man, see, he is honest to acknowledge his own mistake, and willing to correct it!" "Look at Soda-Woman, she was in all these troubles because of her bad tempers. However, she finished the mission safely because she finally knew how to control her temper!" Sound interesting? I bet children is more willing to learn from comics than what you always say beside your ear.
Surely, violence and sex