Do I think discrimination is right?  No.  But, it does exist. 

Curious about something.  Let's take an example of a women-only gym.  I'm sure there are many more gender specific businesses, but I'll use that one.  What allows them to discriminate?   Reason I ask is couldn't a guy like this define his business that wouldn't allow certain sexual orientations to be served?  Just wondering if it's legally possible, since there are gender discriminatory businesses out there?