People still opt for monogamy and marriage.

人们还是选择单一配偶制和婚姻。

《柯林斯英汉双解大词典》

Society values marriage and monogamy, though, so why isn't it doing anything about it?

不过社会提倡的是婚姻和一夫一妻制，那么为什么采取行动来改变现状呢？

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Article 2 a marriage system based on the free choice of partners, on monogamy and on equality between man and woman shall be applied.

第二条实行婚姻自由、一夫一妻、男女平等的婚姻制度。

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On his website, he keeps track of technology that enables cheating and tales of the unfaithful his site background is a collage of photos including David Duchovny, Jude Law, Eliot Spitzer, Bill Clinton and Jesse Jackson but also notes and celebrates monogamy: like the couple married for 85 years who hold the Guinness world record for longest marriage and science that explains our tendency toward fidelity.

FORBES: Celebrating 'Manogamy' on Valentine's Day