>I'm not sure why you refuse to acknowledge any difference between "existing with black skin" and "choosing to enter a consensual sexual relationship with a person of the same sex". One of these components requires a much larger degree of energy and initiative than the other. One of these is the result of an individual making a conscious decision to do a thing.
No. The correct comparison is 'existing with a particular skin colour' and 'existing with a certain sexual orientation'. One does not take more of a conscious effort than the other.
The follow on arguments for whether certain colour mixes or sexual orientations should be allowed to marry are separate.
Homosexuality is a socially beneficial bahaviour is as much as, people exist that are gay. Human nature makes it so. Therefore they should be treated equally.