A heteroromantic bisexual (sometimes called a heteromantic bisexual) is a person who is sexually attracted to two or more genders but romantically attracted to only the opposite/different gender. For example, a heteroromantic bisexual woman could be someone who is sexually attracted to both men and women, but is only romantically attracted to men. Bisexual isn't limited to just the attraction to men and women, however, so heteroromantic bisexual people do not have to be exclusively sexually attracted to the two binary genders.
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