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anthro biped erection felid foreskin fur genitals glans hand_behind_head holding_own_penis holding_penis humanoid_genitalia humanoid_penis kronostrat male male_anthro mammal muscular muscular_anthro muscular_male nude partially_retracted_foreskin penis plantigrade prehistoric_species retracted_foreskin saber-toothed_tiger solo standing white_body white_fur