It's Bruce Timm, what do you expect?
This man has had rape or sexual fantasies and innuendo in his shows/movies for years. I guess we know how his mind works.
He even wrote the comic where Batman knocks up Barbara:
I guess we know how his mind works. I can't even begin to imagine what other kinds of sick and twisted fantasies he has in his head that he's never put to paper out of fear of backlash.