Is cheating better than being in polygamist relationship?

The majority of men and women prefer to cheat or be cheated on. For instance, a man is married or in a relationship, he cheats and the women for gives him continuously, vise versa at times. In comparison to those people that in a relationship that are ok with their significant other to see another person, even to share time to take advantage of the time being spent. At some point even become friends to certain extend and is beyond the sex, it can be a friendship with benefits of sex at times. Is is safer who your partner is sleeping with that not knowing who he or she is doing? Is it better lying and being honest? More to come in the next few days