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6:5 animal_genitalia animal_penis anthro balls binaryfox canid canine canine_genitalia canine_penis cellivar dipodomyine duo fellatio fox genitals heteromyid hi_res kangaroo_rat knot knotted_penis knotting lawkie male male/male mammal oral oral_knotting oral_penetration penetration penile penis rodent sex sheath tongue tongue_out tongue_out_fellatio x-ray_view