Monogamy is when you are married to, or in a sexual relationship with, one person at a time. Humans are one of the few species that practice monogamy. Well, sometimes. The difference between monogamy and its antonym, polygamy, lies in the prefixes.

What is it called when you only date one person?

What does monogamy mean? Monogamy most technically refers to the state or practice of being married to only one person at a time. The word monogamy is also commonly used in a more general way to refer to the state of being in a romantic or sexual relationship with only one person at a time.