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2013 3:4 abs abstract_background animal_genitalia anthro athletic balls biceps biped blush bodily_fluids brown_body brown_hair brown_skin clenched_teeth cum cum_on_penis cum_string cumshot dinosaur ejaculation erection fangs flexing genital_fluids genital_slit genitals hair hands-free hands_behind_head hi_res jonathan_alexander male masturbation maxime-jeanne muscular muscular_anthro nude orgasm pecs penis pose precum prehistoric_species red_penis reptile saurischian scales scalie sheath simple_background solo standing sweat tail teeth theropod tyrannosaurid tyrannosauroid tyrannosaurus tyrannosaurus_rex vein white_background