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Males also have same-sex relations, typically with multiple partners of the same age. Despite Bagemihl's roster of examples, homosexual behaviour still seems to be a rarity. Some hold onto each other with their limbs using a "double foot clasp mount", while others sit on top of their mates in a sort of jockey-style position, says Paul Vasey of the University of Lethbridge in Alberta, Canada, who has been studying these macaques for over 20 years. He studies the biology of sexual orientation and the implications for mental health and is the co-author of Born Gay? Genes could themselves nudge one towards a particular sexual orientation or genes may simply interact with other environmental factors such as sex hormones in the womb environment to influence later sexual orientation. Some species of sexually reproducing geckos have been found to display homosexual behavior, e. They must realize that animals can have sex with who they will, when they will and without consideration to a researcher's ethical principles.

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For homosexuality in humans, see Homosexuality.

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'Gay genes': science is on the right track, we're born this way. Let’s deal with it.

Affectionate and playful activities are associated with such relations. It was thought that the X chromosome, which is passed from the mother to the son, carried the variability that accounted for becoming gay. SSS behavior is often shorter than the equivalent heterosexual behavior. Male Drosophila melanogaster flies bearing two copies of a mutant allele in the fruitless gene court and attempt to mate exclusively with other males. Due largely to the female spotted hyena's unique urogenital systemwhich looks more like a penis rather than a vagina, early naturalists thought hyenas were hermaphroditic males who commonly practiced homosexuality.

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In addition to sexual behavior, same-sex pigeon pairs will build nests, and hens will lay infertile eggs and attempt to incubate them. Or after a female hits a juvenile, the latter's mother may lunge at the aggressor, an action that is immediately followed by genital rubbing between the two adults. If the male carrying this sperm mates with a female later, the sperm might get transferred — so the male who produced it has fertilised a female without having to court her. In other projects Wikimedia Commons. Some hold onto each other with their limbs using a "double foot clasp mount", while others sit on top of their mates in a sort of jockey-style position, says Paul Vasey of the University of Lethbridge in Alberta, Canada, who has been studying these macaques for over 20 years.

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