Superpowered Sex (Don't Judge Me!)

I'm having a fic-related crisis in that I can't really write any at the moment. And there is very little flashing across my screen (in the admittedly short time that I am currently looking) that really grabs me.

I don't know what's going on. It's just... not going on.

And then, somehow through links, I ran across one of those 101 Fic Kink Bullet memes wherein someone said that one of their fic kinks included SUPERPOWERED SEX. My brain promptly went two steps to the side and now I want to know, dear flist, what sort of ideas this gives you? List them out in the comments for me - and hey, if anyone gets inspired and wants to actually drabble for it... please do.

I mean, what would sex with Superman really be like? How about Emma Frost? What about the Flash?

Your ideas, I want them!