But again, it's not just the concept of them having sex I'm arguing with, it's the method. There's numerous health hazards to having impulse sex on a roof, in the night air, not to mention possible social issues that would occur if someone looked out the window at that moment, and those are just the things that normal, healthy, and most likely adventurous adults would most likely pause and decide "Wait, we can at least get under some kind of shelter, right? I mean what are we, exhibtionists?"
And that's not taking into account these are masked vigilantes who've been portrayed in every other medium as being paranoid about their identities; having sex where at least one person strips off their entire costume when there's still windows that can look down on them runs so counterintuitive to that idea that, quite frankly, it makes them both idiots. Not impulsive, consenting adults giving into a moment of passion, idiots. At least the equally stupid sex in Catwoman #1 took place in a room; both are examples of poor character work that will frankly leave plenty of DNA evidence for anyone looking for it, but at least one isn't an IPhone away from the Commisioner being asked "Sir, the sex tape seems to display a ludicrously toned redhead who looks exactly like your ludicrously toned red headed daughter mounting Batman in the night sky. Any comment?"
Face it, the moment, in its execution, regardless of its concept, is more at home in fanfiction than any published work. It makes a questionable characterization decisions just a stupid what-the-hell moment.