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It's entirely possible that in some species, same-sex sex could have fitness benefits, Monk and her colleagues wrote in their paper, published Nov. That's the implication of a new study on same-sex behavior in animals. One piece of evidence supporting this hypothesis is that some echinoderms, including sea stars and sea urchins, engage in same-sex sexual behavior. Other studies have posited that same-sex sexual behavior is a side effect of other genes that have reproductive benefits. Instead, same-sex sex may have emerged very early in time and could persist simply because engaging in it doesn't cost animals much, evolutionarily speaking. But other evidence is slim, largely because scientists haven't systematically studied same-sex sexual behavior in animals.

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But other evidence is slim, largely because scientists haven't systematically studied same-sex sexual behavior in animals.

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Those sex-distinguishing traits may have all come later in the evolutionary chain, the authors argued. But other evidence is slim, largely because scientists haven't systematically studied same-sex sexual behavior in animals. Most observations have been accidental, and biologists have often viewed sex between two animals of the same sex as irrelevant or improper to note, Monk said. So any effort expended on mating with the same sex would be compensated for by not spending energy evolving and maintaining distinctive secondary sex characteristics , like differing colors, scents and behaviors.

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