Sexual desire originates in reproduction of life so where does the desire for same sex originate?

Atheists and homosexuals I am not asking about personal decisions but about the origin of the desire.
I have to repeat my questions in order to put in such a way that atheists cannot slip out from under the question as they always try to deflect logical questions.
Stupid people I am not talking about personal decisions and the fact that you have sex even after getting your nuts cut up but that where the original desire behind sex originates. Please try to understand as hard as it maybe for you.
 
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