I meet a woman once who said, "I've been monogamous with everyone one I've been with."
I think she meant fidelity, cause that's not monogamy, or else there would be monogamous prostitutes. Unimaginable.
And in that sense, there aren't many monogamous people left. Fidelity is probably more important at this point and that takes self discipline.
But that is the least popular of the fruits of the Spirit.
Galatians 5:22-23 But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control; against such things there is no law.