A couple things to clear up here, tomas ... first, cuckolding doesn't imply biracial relationships, so the color of the "bulls's" skin is coincidental and more of a fetish to cuckold relationships. Second, the female (except in very unusual situations) always picks her lovers. If it is a voluntary cuckold relationship, the cuckold husband may have an opinion ... but if it is a true cuckold relationship, his opinion doesn't exist.
Men often times initiate cuckold relationships by encouraging their wives to be with other men, but the wives pick the men ... as often, and as many as she pleases. The husbands may or may not be involved with their wives' activities.