The terms heteroflexible and homoflexible are mainly applied to bi-curious people, though some authors distinguish heteroflexibility and homoflexibility as lacking the 'wish to experiment with sexuality' implied by the bi-curious label. Such continuums include mostly-heterosexual or mostly-homosexual, but these can be self-identified without identifying as bisexual.
The term is sometimes used to describe a broad continuum of sexual orientation between heterosexuality and bisexuality.
Bi-curious is a term for a person, usually someone who is a heterosexual, who is curious or open about engaging in sexual activity with a person whose sex differs from that of their usual sexual partners.