Cuckolding is a strange fetish. The cuckold is the husband. he is well aware his wife is cheating on him. Often he watches while his wife is fucked by a stranger. But it can also be so that she cheats him with the neighbour dude while he is only allowed to know. The bull is the lucky guy who is screwing the adulterous wife. Some wives only want to humiliate their husbands with black dudes with big black cocks.