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2023 abstract_background alternate_version_at_source animal_genitalia animal_penis anthro balls big_balls big_knot big_penis canid canine canis digitigrade equine_genitalia equine_penis erection genitals hi_res huge_balls huge_knot huge_penis hybrid_genitalia hybrid_penis hyper hyper_balls hyper_genitalia hyper_knot hyper_penis knot knotted_equine_penis knotted_penis male mammal medial_ring nude penis sitting solo theneonfox vein wolf