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2013 abs animal_genitalia anthro anus athletic backsack balls biceps big_muscles big_penis brown_body brown_skin butt butt_grab color_swatch darkened_balls darkened_genitalia darkened_penis darkened_perineum dinosaur disembodied_hand duo erection flaccid foreskin genitals glans green_eyes grey_background grin hadrosaurid hand_on_butt humanoid_genitalia humanoid_penis looking_back male model_sheet muscular muscular_male narse nude ornithischian ornithopod parasaurolophus partially_retracted_foreskin pecs penis perineum pink_anus pink_glans pose prehistoric_species presenting presenting_hindquarters reptile scales scalie simple_background smile standing tail teeth translucent unretracted_foreskin vein