Roomates.com is not a property owner renting out rooms or apartments, they're just an internet service that helps people find (somewhat compatible) roommates.
If an individual doesnt want to be roomies with a homosexual, or black, or jewish person, etc, then thats their business.
This is a stupid decision that needs to be overturned.
If this is the 9th Circus..then it probably will be overturned since most of their rulings are overturned...catch a clue judges!
You can be certain that nothing will be done legally to harass the many sites where gay people are assisted in finding other gay people to rent to/from.