I think people should just relax. So, Batman and Catwoman had sex. It was a bit of a surprise to see it that way, but I suppose that was the point. You have to grab your readers with the first issue they pick up. I doubt that soft-core porn is going to become the staple of this or any other DC comicbook.
I really didn't see anything offensive in showing straightforward coitus between two consenting adults. Then again, I'm European.