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abs against_surface against_window anal anal_penetration anthro balls biceps circumcised circumcision_scar claws duo equid equine erection fangs from_behind_position genital_scar genitals hair horse humanoid_genitalia humanoid_penis interspecies legs_up male male/male male_penetrated male_penetrating male_penetrating_male mammal monochrome muscular mustelid nipples on_glass open_mouth otter pawpads paws pec_grab pecs penetration penis presenting scar sex sketch standing sudonym teeth toe_claws tongue window