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2017 abstract_background alternate_species animal_genitalia animal_penis balls biceps big_penis brown_eyes castbound centaur equid equid_taur equine_genitalia equine_penis erection european_mythology genitals greek_mythology hands_on_hips hi_res hooves humanoid_taur looking_at_viewer male male_taur mammal mammal_taur mythology navel nipples nude pecs penis russell_(castbound)sheath solo split_form taur vein