I have to admit that I have a visceral response similar to Alan's, but I was brought up in a purity bubble where the only take-away I got from the sex talk I had with my mom at age 10 was to "always be modest" which to me meant I always had to wear long sleeves because otherwise somehow the sperm (which boys were sprinkled with like dandruff) would infiltrate my epidermis and get me pregnant.
I think that what makes me squeamish about Alan's example is the fact that it's in comic book format. I think I would be horrified to think my young teen kids would read it, but again, that's a visceral response based on my background, and my parental instinct that some things should not be readily available for consumption (to my kids at least).
Whether this material should be part of a public library system is a different question. The stuff is out there anyway. I don't see the point of censorship in this culture.