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Much of the research done on these sexual behaviors assumes that same-sex sex is costly for animals and that different-sex sex is not costly, she said. Echinoderms evolved early in the history of life, likely in the Precambrian period more than million years ago. Then, researchers could compare species from across the tree of life to determine if all linages show same-sex behavior. This could explain why same-sex sex is so common throughout the animal kingdom: It didn't evolve multiple times independently, but was instead part of the fabric of animal evolution from the start. The new hypothesis undercuts old assumptions about same-sex behaviors, said Caitlin McDonough, a doctoral candidate at Syracuse University and a study co-author. The assumption that there must be an evolutionary reason for all this same-sex sex has led researchers to search for possible benefits to same-sex behavior.

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Other studies have posited that same-sex sexual behavior is a side effect of other genes that have reproductive benefits.

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The assumption that there must be an evolutionary reason for all this same-sex sex has led researchers to search for possible benefits to same-sex behavior. Much of the research done on these sexual behaviors assumes that same-sex sex is costly for animals and that different-sex sex is not costly, she said. In evolutionary biology, the ability of an animal to reproduce given its environment is called fitness. In evolutionary science, same-sex sexual behavior has long been viewed as a conundrum: Why would animals spend time and energy doing something sexual that won't pass along their genes to the next generation?

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