I'm a big Batman fan, have been since I was a kid. Given that his cover was pretending to be a rich playboy, there was lots of sexual innuendo. And most of the female villains either showed a lot of skin, or were completely covered in something skin-tight.
And then there's Catwoman. She oozed more than a little blatant sexuality onto the pages of Batman comics. And who hasn't seen a sexy, skimpy Catwoman costume?
The other comic series I'm a bit of a rabid fan of is ElfQuest, though they're definitely more toward the graphic novel end of the spectrum. The art is beautiful, the stories are great if you like fantasy, and while it's full of sexuality, it's an kind of innocent sexuality because it isn't taboo. Oh yeah, and there's an orgy in book 4. No genitalia, but it's very clear what it is you're seeing.