Marriage and employment are not good comparisons. They are not viewed the same by the courts and ultimately it is the courts that decide where preference stops and discrimination begins.
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The courts will not tell you who you can hire, they only tell you what criteria you are not allowed to use in that determination...race, sex, age, etc.
The courts on the other hand do tell us who we can and can't marry to an extent. I seem to recall there being states that won't allow same sex couples to marry.
As long as your choices effect you and only you it is not a problem. It is when it starts to effect others (and I don't mean a hypothetical wife or husband) that it becomes a real problem.
We can play what if all day and all it does is go around in circles. What if my aunt had balls? Well, she'd be my uncle.
Well, you still have'nt answered. That's still ok.
And I certainly think that marriage effects others more than a job or aplace to live