In addition to being a civil union, many consider marriage to also be a religious union and rite. So, Rao has chosen to relay this report from Christopher Holden at The Mary Sue blog though it may not be explicitly religious (or, at least, not yet):

I am fairly confident that there has never been a polygamous, same sex marriage in mainstream comics before […] Regardless of whether this marriage remains canon or not, Gail Simone made a bold move in writing it into her last issue, and deserves admiration for including it because it was not done for shock value and stays true to the characters she had developed.

Get all the details on Scandal, Knockout, and Liana over at The Mary Sue, but, lest one is skeptical, here’s an image from the storyline in question.

Rao wants to know: Does this rare union pertain to religion, or is it exclusively a comics milestone/footnote?