King chose to put them into a story where they experienced not just physical conflict, but also emotional conflict, and one that, ultimately, showed the strength of Bruce and Selina's relationship (as well as Bruce and Diana's friendship). My initial point still holds: Some people are holding Diana to different standards than Bruce, casting her as a "temptress", etc. A writer cannot be faulted for some people's values coloring their interpretation of a story.
That said, stacked up against the rest of the run, I didn't think it (#39) was a great issue. I thought the "cliffhanger" was cheap and cheesy. In television, they used to call that type of ending "schmuckbait", because only "schmucks" would fall for it.