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1:1 abs anthro asinus biceps big_muscles black_hair bodily_fluids donkey equid equine erection foreskin fur furryrevolution genital_fluids genitals hair humanoid_genitalia humanoid_penis low_res male mammal muscular muscular_anthro muscular_male nipples nude partially_retracted_foreskin pecs peeing penis pubes solo urine urine_stream vein