Species that mate with the same sex

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When a male sand-sifting sea star in the coastal waters of Australia reaches out a mating arm to its nearest neighbor, sometimes that neighbor is also male. Mating, pseudo or otherwise, with a same-sex neighbor obviously does not transfer a set of genes to the next generation—yet several sea star and other echinoderm species persist with the practice. They are not alone. From butterflies to birds to beetles, many animals exhibit same-sex sexual behaviors despite their offering zero chance of reproductive success. Given the energy expense and risk of being eaten that mating attempts can involve, why do these behaviors persist?
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How Do Fish Mate: The Ultimate Guide

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Non-reproductive sexual behavior in animals - Wikipedia

For definitive proof that gender is indeed fluid, look no further than the animal kingdom. There, certain organisms change their reproductive identities or adapt the behavior of the opposite sex based on a time-specific need. Some animals even have working male and female genitalia. In a process known as sex reversal, bearded dragons have demonstrated an ability to somewhat change their sex from male to female while still in the egg.
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Non-reproductive sexual behavior in animals

When a male sand-sifting sea star in the coastal waters of Australia reaches out a mating arm to its nearest neighbor, sometimes that neighbor is also male. Mating, pseudo or otherwise, with a same-sex neighbor obviously does not transfer a set of genes to the next generation—yet several sea star and other echinoderm species persist with the practice. They are not alone. From butterflies to birds to beetles, many animals exhibit same-sex sexual behaviors despite their offering zero chance of reproductive success.
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Cryptococcus neoformans is a major cause of fungal meningitis in predominantly immunocomprised individuals. It had been a mystery why one mating type is overwhelmingly predominant in nature and how the capacity for sexual reproduction is maintained in a largely unisex population. Same-sex mating had been observed under laboratory conditions, but direct evidence for naturally occurring same-sex mating was lacking. This study provides the first evidence of this and sheds light on the genetic and environmental factors that play important roles in the evolution of the current population structure of this pathogenic fungus.
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