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1:1 animal_genitalia animal_penis anthro balls bovid bovine cattle chair equine_genitalia equine_penis furniture genitals hi_res hooves horn knottynaughty male mammal masturbation muscular muscular_male nude on_chair penile penile_masturbation penis sitting sitting_on_chair smile smiling_at_viewer smirk smirking_at_viewer solo vein veiny_penis