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anthro balls darkgem foreskin genital_piercing genitals grey_background greyscale half-erect humanoid_genitalia humanoid_penis looking_at_viewer male male_anthro mammal monochrome musclegut muscular muscular_anthro muscular_male nude partially_retracted_foreskin penis penis_piercing piercing prince_albert_piercing pubes simple_background slightly_chubby solo standing suid suine sus_(pig)wild_boar