Relationship status does not change a person’s sexuality. While it may be more obvious to others that someone is bi if he or she is actively dating men and women, that is most certainly not a requirement of bisexuality. Bisexuality, like all sexual orientations, is about much more than what one does with one’s genitals. It encompasses not merely one’s relationships and sexual activity, but also their sexual and romantic attractions. A person can be in a long-term monogamous relationship with a woman but still be attracted to men as well. Sexual orientation doesn’t go away just because it’s not acted upon.
Bisexuality manifests itself on many levels in an individual, most of which are not affected by marital status or monogamy. The Klein Sexual Orientation Grid, for example, seeks to address the broadness of a person’s sexuality by breaking it down into: sexual attraction, sexual behavior, sexual fantasies, emotional preference, social preference, lifestyle preference, and self-identification. While a monogamous marriage would strictly limit a person’s current sexual behavior, it would not affect a person’s attractions, fantasies, emotional preferences, social preferences, lifestyle preference, nor would it have to change a person’s self-identification. In this example, out of seven measures of sexuality, only one would necessarily be affected by monogamous marriage.