Monogamy is a noun and must be used as such. It does not describe a relationship but rather is a thing - the state of having only one partner as a time. Thus, an appropriate use would be "I support monogamy in relationships because I feel it is important to only have one sexual partner at any one time." To use monogamy as a description, it must be changed to its adjective form, monogamous.
monogamy
Monogamy means the practice of having only one wife
My aunt is monogamy.
Monogamy - album - was created in 2000.
The Myth of Monogamy was created in 2001.
serial monogamy
Synonym: Bigamy Antonym: Monogamy :D
monogamy
The Game of Monogamy was created on 2010-10-05.
monogamously
monogamy