Confused about which mutants are married to whom? This chart by Joe Stone ought to clear up some of the confusion. It's missing the people who've slept with Wolverine, but that topic deserves its own diagram.
I couldn't choose! Honestly, I'd love to see them paired up to fight the villains. Tony would just be like, "Hey, X, buddy we need you and your weird freaks to help us take down this huge thing, yeah..."