Then it would follow that men who don't produce sperm are technically gay.
Same for women and eggs. Then technically, it would seem you'd be looking for a defective gene.
But the reasons that people can't reproduce are usually some other reason...but not genetic.
Not the same as being gay. The inability to product sperm or egg can occur naturally. In those cases, I would have to wonder if that also was nature ending a line. Why else would biology do that?