Rule 34 Dev - abs anthro balls biped cloven_hooves contrapposto erection fingers foreskin genitals glans grey_background hand_on_butt hand_on_hip hand_on_penis hooved_fingers hooves horn humanoid_genitalia humanoid_hands humanoid_penis looking_at_viewer male model muscular muscular_anthro muscular_male navel nipples nude penis pose realistic retracted_foreskin sculpt simple_background solo standing tail tail_tuft thick_neck three-quarter_view tuft unguligrade vein veiny_muscles tergos bovid bovine cattle mammal 2011 3d_(artwork) digital_media_(artwork) model_sheet shaded soft_shading zbrush_(artwork)|6464416840