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4_toes biped briefs clothing dinosaur erection feet genitals horrorbuns looking_at_viewer male musclegut muscular muscular_male penis penis_poking_out penis_through_fly plantigrade pose prehistoric_species reclining reptile saurischian scalie solo tail theropod tighty_whities toes tyrannosaurid tyrannosauroid tyrannosaurus tyrannosaurus_rex underwear white_briefs white_clothing white_underwear