Now that he's thought longer about it, Michael also likes to describe himself as "biromantic". He is keen to have a romantic relationship with either a man or a woman.
2010, Lori A. Brotto, Gail Knudson, Jess Inskip, Katherine Rhodes, & Yvonne Erksine, "Asexuality: A Mixed-Methods Approach", Archives of Sexual Behavior, Volume 39, Issue 3, June 2010, page 603:
Eleven percent of all participants chose ‘‘other’’ as their sexual orientation and this was indicated as heteroasexual, biromantic asexual, or homoasexual in free response format, and one participant indicated ‘‘fetishist’’ as his sexual orientation.
2012, Anthony F. Bogaert, Understanding Asexuality, Rowman & Littlefield (2012), →ISBN, page 15:
So, for example, it is not unusual for an asexual person to say that he is asexual but biromantic, or that she is asexual but heteroromantic.
2012 June 21, Andrew Perron, “Re: LNH/Meta: Queer LNHers”, in rec.arts.comics.creative[1] (Usenet):
He might be biromantic, but he hasn't told me either way.
Within this group of romantic asexuals, orientation varies: heteroromantics only feel romantic attraction to the opposite sex, homoromantics to the same sex, biromantics to both sexes and panromantics without reference to sex or gender.
For my part, I decided this year not to mention allies in the laundry list of identities represented (I also didn't mention heteroflexible biromantics), underscoring the Sisyphean task of creating an inclusive list of identities.
2015, Erinn Williams, "A Different Sexuality", The George-Anne (Georgia Southern University), Volume 89, Issue 46, 10 February 2015, page 7:
Panromantics, unlike biromantics, will tend to feel that their partner's gender does little to define their relationship.