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2013 abs animal_genitalia anthro anus balls biceps big_muscles biped blue_body blue_penis blue_skin butt claws dinosaur erection fangs flexing genitals grin hand_behind_head horrorbuns humanoid_genitalia humanoid_penis looking_at_viewer male markings masturbation muscular muscular_anthro muscular_male nude pecs penile penile_masturbation penile_spines penis pose prehistoric_species presenting presenting_hindquarters red_body red_skin reptile saurischian scales scalie sheath sitting smile solo spread_legs spreading stripes tail teeth theropod toe_claws tyrannosaurid tyrannosauroid tyrannosaurus tyrannosaurus_rex