MARVEL COMICS IS ON A ROLL. First there was the blockbuster "X-Men" movie that generated almost $300 million worldwide. Then came "Spider-Man," which grossed more than $800 million. Coming in February, Ben Affleck will star in "Daredevil." In that same month, Marvel will be bringing back to comic book stores a cowboy hero known as the Rawhide Kid. From 1955 to 1979, Rawhide Kid battled the outlaws of the Wild West as part of a Western-themed series that included other heroes like the Two-Gun Kid and Kid Colt. At the time, nobody ever asked if Rawhide Kid dated any girls,...