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4:3 anal anal_penetration anthro barely_visible_genitalia barely_visible_penis bite biting_lip biting_own_lip butt canid canine duo erection faint female female_penetrated from_behind_position genitals intraspecies jockey_position lying male male/female male_penetrating male_penetrating_female mammal muscular muscular_male nude on_front penetration penis prone_bone_position scar self_bite selfcest sex smile speed_bump_position square_crossover