Ajahn Brahm gives an interesting talk on monogamy, polygamy and the third option solitude. Ajahn discusses the benefits of a committed monogamous relationship and the qualities that support it. Ajahn stresses that it is the way we do things that is most important, not so much what we do. Are you doing it kindly, compassionately, wisely or selfishly with no concern for the other person?
Teachings are available for downloading from the BSWA Youtube Channel, the BSWA Podcast, and Deeper Dhamma Podcast.