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2016 abs abstract_background animal_genitalia animal_penis anthro ball_rope balls bdsm big_balls biped bondage bound bovid bovine cattle cock_and_ball_torture dieselbrain erection genital_rope genital_torture genitals hi_res horn kneeling male mammal muscular muscular_anthro muscular_male navel pain penis penis_rope restraints rope rope_around_balls rope_bondage solo submissive submissive_male vein veiny_penis