Either:
A. They are born or Genetically rewritten to be attracted to the same sex, thus being counterproductive to nature and all natural processes.
Or
B. They choose to be that way and promote the 'Sex Magic' that it is, thus purposely opposing natural processes and Nature, similar to Cannibalism .
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No. People like to get their rocks off. I'm not homosexual but I know if societal pressures were different there would be no significance as to who or what you gotta rub on to get a nut.