In this day of political correctness, the ideal of freedom of expression becomes even more seperated from the reality because people are afraid to open their mouths and dance around everything to avoid arguments or being sued. No one wants to be made an example of for a casual remark they barely remember making.
I haven't read the book or seen the movie, but reviews I've read of the film suggest one character is more the agressor while the other is more reticient - maybe that reluctance comes from not wanting to come out of the closet & the encounters are always consensual, but it could still be viewed as being 'predatory' in the sense that if the one wasn't agressive about actively pursuing, the relationship would not have continued for so long? But then, like I said, I haven't seen the movie so maybe I'm talking out my ass here...
My point I guess is that perhaps Shalit really does view the film relationship dynamic that way and used the term precisely because he figured he'd use it if the couple was hetrosexual, so therefore he deemed it appropriate to use for this movie. I've certainly heard him use such similar phrases before (not that I could quote you specific examples), he's been around a long long time, and he's always had that loud and kind of abrasively quick style, even when he's ga-ga over a film.