hetero-duogamy

The circumstance of having two sexual partners, both of the gender opposite to one's own. Distinguished from "duogamy," which most often refers to having one partner of each gender.

Jane's hetero-duogamy entails her relationship with Elaine, her girlfriend, as well as her relationship with her husband, Bill, whom she loves, but not enough for her to kill him.

hetero-duogamy by Argolander November 30, 2018

hetero-duogamist 

Someone with two sexual partners, each of the gender opposite to his or her own. Distinguished from the more common term "duogamist," which most often refers to someone with one partner of each gender.

Jill, a hetero-duogamist, has a husband, Mike, and a boyfriend, Charles.

hetero-duogamist by Argolander November 30, 2018