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[taikara]

According to Darwin, homosexuality (and actually any sexual attraction to anything but the opposite sex of your species), is a genetic mistake.

Except in the case of some creatures that can asexually reproduce, such as bacteria, or reproduce hermaphroditically, such as worms.

After all, if you don't reproduce, you can't pass on your genes, which leads to extinction of those certain genotypes.

Humans are more than just the sum of our DNA, though. We are something of an incredible anomoly. We can surpass our genetic programming through science, which allows us to reproduce and pass on DNA even if we aren't attracted to the "correct" gender for reproduction, through sperm/egg donation and implantation techniques.

Technically, humans have the ability to be completely above their primordial animalistic roots and give up sex altogether.