For humans, being gay or homosexual refers to a sexual attraction or preference to those of the same sex. Homosexuality in animals is defined quite differently.
Same-sex behavior that is not inherently sexual in character. Same-sex courtship or copulatory behavior occurring over a short period of time. Long-term pair bonds between same-sex partners.
Homosexuality in animals is behavioral rather than a sexual orientation, meaning they will have sex with whoever they want, whenever they want without regard for any of our perceptions or ideas about it.
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Typically, most humping is caused by nonsexual arousal, like excitement or play.