It is true that there are many men or women available who desire open relationships that aren't based on too much commitment or involvement because they have other priorities, and that is their choice. I will say that the inability to treat one other human being with respect, honesty, and devotion, to never be able to completely give your heart to them, and when you start getting close to have to find another, is in the majority of cases a sign of a stingy lover.
We've all read throughout history the many, many Don Juan clique's in which men demonstrate an extraordinary level of power over women. This has been heralded as the epitome of the great lover, but these tales are never told by the women. Great lover? How come it was never memorable enough to inspire a woman to express it in song, painting, or poem at some point in history? Why didn't a Medieval Dame, Bourgeois lady, a princess, or a Dutchess ever tell the tale of that great lover who had her and so many others? No one except the men ever seem to remember.