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ambiguous_gender animal_genitalia anthro arthropod belly big_belly canid canine canis cutaway domestic_dog double_penetration duo forced fully_sheathed gastropod genitals heart_symbol infestation insect internal larva male mammal mollusk navel navel_fetish navel_penetration nude oddbird parasite penetration penis pregnant pregnant_anthro pregnant_male rape sex sheath tentacle_rape tentacle_sex tentacles torture wolf