15. The Ultimates #8
Hey, what's so bad about a couple hanging out on a comic book cover? They're not even canoodling, or half-dressed, or anything! They're just holding hands!
Well, yeah, but Quicksilver and Scarlet Witch are also brother and sister. And in the pages of The Ultimates #8, they very much are canoodling, often whilst half-dressed. Vom.