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4_toes abs anthro apatosaurus astor balls biceps big_balls big_claws big_feet big_penis biped black_nipples black_penis brown_eyes claws colored countershading digital_media_(artwork)dinosaur diplodocid diplodocoid feet finger_claws flaccid front_view genitals gideon grey_body grey_skin grey_stripes hands_on_hips huge_balls huge_penis humanoid_genitalia humanoid_penis hyper hyper_genitalia hyper_penis long_neck long_tail looking_at_viewer male markings muscular muscular_anthro muscular_male muscular_thighs navel nipples nude paws pecs penis plantigrade prehistoric_species quads reptile saurischian sauropod sauropodomorph scalie simple_background smile solo standing striped_arms striped_back striped_legs striped_markings striped_neck striped_tail stripes tail tail_markings toe_claws toes white_background