A mixed-orientation marriage is a marriage between partners of differing sexual orientations. The broader term is mixed-orientation relationship and both terms are often shortened to MOM and MOR respectively.
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The people involved in such a marriage may not be romantically or sexually compatible, for example if the marriage is between a heterosexual male and a homosexual female. The term also applies when one of the partners involved is asexual or aromantic, leading to a mixed desire for sexual activity or romantic activity.