homo-duogamist
Someone with two sexual partners, each of the same gender as his or her own. Distinguished from the term "duogamist," which most often refers to someone with one partner of each gender.
Jill, a homo-duogamist, has a wife, Janet, and a girlfriend, Alice.
duogamist
Someone with two sexual partners. Most often used of a bisexual person with one partner of each gender.
Mike, a duogamist, has a new boyfriend, Jack, and a new girlfriend, Jill.
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.