Flexible
As a suffix in relation to gender identities and sexual orientations, “flexible” means that a person feels mainly aligned with a particular identity or orientation, but does not understand it as rigid or exclusive. The term indicates that exceptions, transitions, or situational variation may occur.
A heteroflexible person usually describes themselves as predominantly heterosexual, but not exclusively limited to the other sex or to other genders. The term is mainly useful as a self-description intended to express a person’s experience of attraction as accurately as possible.