Dude, you're overreacting. and surely goo sexual education is necessary etc... I mean, i see why you don't want your son/ daughetr of the future to become a ra;ist or killer, but maybe it would EDUCATE them about it... kind of a depressing Cirt cobaine style moral...
I would have no problem with them knowing about it, it's just life, like I said above. However, I don't think a comic book is the correct place to first learn about such things. Kind of like parents that let their television be the baby sitter, they have no idea what their kids are seeing and learning about. I wouldn't completely censor a child, like I said there's a fine line, and it's tough to know exactly what to do.
For some reason this kind of reminds me of the Patton Oswalt bit about his favorite movie: The Good, the Bad and the Ugly. His wife can't stand it because it's violent, but whenever he comes home she's watching CSI and Court TV specials about autopsies and gruesome crime scenes and he comments how that stuff is wildly more violent and disturbing than any Eastwood film. So who's right in that situation and what is worse? People getting shot, or seeing the aftermath?
You advocate education, a laudable cause, but education isn't tossing some kid a comic book, or a movie, or whatever it be, and hoping they don't turn out like "Cirt cobaine" [sic]. There should ever be a mentor and a pupil who both put in as much effort as the other. For my own children, I truly have no idea how I'll approach it, but for my sister, for now, this is how I'm doing it when I'm buying her some comics. As to sexuality, morals, ethics, life and death, and all things that life is composed of, well I'm leaving that to our parents for now. They did well enough for me.