(admitting to not having read the whole conversation) yes it is discrimination, no you have no case. We've got the same thing at my firm. The issue is that you DO have the option to choose to get married if you want the health benefits that married couples get, whereas were you a man or living with another woman, you would not be able to choose that. By choosing not to get married, you ARE choosing (in law if not in fact!) not to reap the benefits of marriage, including, unfortunately, health insurance. Personally, if I'm willing to pay the extra premium, I don't see why they wouldn't allow me to add anybody I bloody well pleased to into my health insurance. I have a good friend with none, I'd love to cover him under my policy. But noooooooooooooooo.