I lied about the sex, but there's plenty of blood and terror. I picked up the collected edition of this comic book in my local library, having seen the film a couple of years ago. I have been reading comics since the early 1960s, so I am not just a casual browser of comics, but I never felt a great need to read this one before, which probably does make me a casual browser today. The basic story is that one day, a comic nerd asks the question - why has no one tried to be a super-hero before? So he buys himself a costume off of EBay and goes out into the night to be a vigilante, quickly ending up in hospital. Outfitted with metal plates in his head, and a deadened sense of pain, he has another, more successful go, and ends up as a You-tube sensation. Seeking to help out a young lady with a stalker ex-boyfriend, he is witness to a visitation from Hit-Girl, another, but more serious vigilante, who, with her crime-fighting partner, Big Daddy, is destroying a drug baron's network. Anyway, traps are laid, heroes are captured and tortured, rescues are effected, and revenges are had. You've seen the film, you know the body count.
The comic book had a different target audience than the film, and so the more extreme comic-related references were toned down in the film, as was the graphic violence - no entrails or brains flying about if you want a `15' rating, and Big Daddy dos not look like Batman in the comic, though he does look like Nicholas Cage... And the comic version is probably more `grounded' in reality, though the comic is a good comic story, and the film is a good action/adventure/ superhero film. By comparing the two, you can probably draw a good lesson in how a story works best when told in two different media, and how different elements should be expanded or edited to suit the different requirements of said media; unlike Watchmen, for instance, where they tried to follow the comic faithfully, only making tiny adjustments which - to me - changed Rorschach's character and motivation.
Anyway, this is an entertaining comic book if you like well-told graphically violent comic books, as well as if you enjoyed the film.