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“The attitude that homosexual activity is not "genuine" sexual, courtship, or pair-bonding behavior is also sometimes made explicit in the descriptions and terminology used by researchers... This attitude is also encoded directly in the words used for homosexual behaviors: rarely do animals of the same sex ever simply "copulate" or "court" or "mate" with one another (as do animals of the opposite sex). Instead, male walruses indulge in "mock courtship" with each other, male African elephants and gorillas have "sham matings", while female sage grouse and male hanuman langurs and common chimpanzees engage in "pseudo-matings". Musk-oxen participate in "mock copulations", mallard ducks of the same sex form "pseudo-pairs" with each other, and blue-bellied rollers have "fake" sexual activity. Male lions engage in "feigned coitus" with one another, male orang-utans and savanna baboons take part in "pseudo-sexual" mountings and other behaviors, while mule deer and hammerheads exhibit "false mounting"...
Even the use of the term 'homosexual' is controversial. Although the majority of scientific sources on same-sex activity classify the behavior explicitly as "homosexual" - and a handful even use the more loaded terms 'gay' or 'lesbian' - many scientists are nevertheless loath to apply this term to any animal behavior. In fact, a whole "avoidance" vocabulary of alternate, and putatively more "neutral", words have come into use... The use of "alternate" words such as 'unisexual' is sometimes advocated precisely because of the homophobia derived by the term 'homosexual': one scientist reports that an article on animal behavior containing 'homosexual' in its title was widely received with a "lurid snicker" by biologists, many of whom never got beyond the "sensationalistic wording" of the title to actually read its contents.”
― Bruce Bagemihl, Biological Exuberance: Animal Homosexuality and Natural Diversity

“As we have seen, one way in that zoologists have tried to avoid classifying same-sex activity as "homosexual" is by using terminology and behavioral categories that deny it is a sexual activity at all. This approach also extends to the interpretations, explanations, and "functions" attributed to same-sex behavior, even when it involves the most overt and explicit of activities. Astounding as it sounds, a number of scientists have actually argued that when a female bonobo wraps her legs around another female, rubbing her own clitoris against her partner's while emitting screms of enjoyment, this is actually "greeting" behavior, or "appeasement" behavior, or "reassurance" behavior, or "reconciliation" behavior, or "tension-regulation" behavior, or "social bonding" behavior, or "food exchange" behavior - almost anything, it seems, besides *pleasurable sexual* behavior. Similar "interpretations" have been proposed for many other species (involving both males and females), allowing scientists to claim that these animals do not really engage in "genuine" (i.e., purely sexual) homosexual activity. But what heterosexual activity is ever "purely" sexual?”
― Bruce Bagemihl, Biological Exuberance: Animal Homosexuality and Natural Diversity

“The vehement pathologizing of transgender encapsulates the entire discussion surrounding the "cause" of alternate sexual and gender expression in animals. Phenomena such as homosexuality or gender mixing are never seen as neutral or expected variations along a sexual and gender continuum (or continua), but rather as abnormal or exceptional conditions that require explanation. At the root of this perception is the idea that homosexuality and transgender are dysfunctional behaviors or conditions because they do not lead to reproduction.”
― Bruce Bagemihl, Biological Exuberance: Animal Homosexuality and Natural Diversity

“The scientific discourse surrounding animal homosexuality has been preoccupied with finding an *explanation* for the phenomenon, often at the expense of providing comprehensive descriptive information about, or acknowledgement of, the actual extent and diversity of same-sex activity throughout the animal kingdom. Rather than being seen as a part of a spectrum of natural variation in sexual and gender expression, homosexuality and transgender are viewed as exceptions or anomalies that somehow stand outside the natural order and must therefore be "explained" or "rationalized".”
― Bruce Bagemihl, Biological Exuberance: Animal Homosexuality and Natural Diversity