What is a defining feature of a person identifying as bisexual?

A defining feature of a person identifying as bisexual is the attraction to multiple genders. This means that bisexual individuals experience sexual or romantic attraction to people of more than one gender, which can include men, women, and non-binary individuals. The term encompasses a broad spectrum of experiences and understandings of attraction, allowing for a varied interpretation of what it means to be bisexual.

The other choices do not accurately capture the essence of bisexuality. For example, attraction to people of only one gender characterizes a person as either heterosexual or homosexual, which does not fit the definition of bisexuality. No attraction to any gender would suggest asexuality, which is distinctly different from bisexual identities. Lastly, attraction only to the opposite gender aligns with heterosexuality or homosexuality, depending on one's own gender identity, and again does not represent the bisexual experience.