Heteroflexible

This term refers to people who are mostly attracted to the "opposite" gender but are also open to some form of play, romance or sexual contact with the same sex or gender (or with those whose sex / gender falls outside the male/female binary).

The meaning of heteroflexibility is subjective; there's not just one way to be heteroflexible, for some people the attraction may be physical, aesthetic, romantic, sexual, emotional, or a combination of these.