The underground comix of the '60s and '70s were NSFW long before any of us had ever heard of NSFW. Often available only in head shops, these alternative publications delivered a dose of sex, drugs and violence then missing from mainstream comic books.
Thanks to mickey the pixel, we get to look back at a gallery of 233 of those underground comix covers, many of them devoted to sci-fi, fantasy and horror.
We've pulled a few of our (relatively mild) favorites here. If, after looking at them, you decide to check out the others, remember—you've been warned!
(via Comics Alliance)