Glad you had examples, was going to mention that back in the day one could find some naughtiness in color on a commodore 64 - but as the post mentions retro pcs - I recalled being able to get shared files and print on an okidata printer several sheets of paper, that when done gave you a decent nude centerfold type thing from ascii - closest I recall from the ibm types back then.
Also: http://girls.c64.org