for actor and activist nico tortorella a most unconventional relationship is challenging labels.e's my "nightline" co-anchor juju chang. >> when bethany and i met in 2006, i was a boy and she was a girl. whatever that means. >> reporter: this is not your typical boy meets girl love story. >> today bethany and i both identify as non-binary and prefer they, them pronouns. >> reporter: actor nico tortorella and bethany c. meyers are a uniquely modern couple. >> my wife, my husband my best friend my partner my everything. >> reporter: both are gender fluid. their marriage: polyamourous, redefining what it means to be husband and wife. >> i mean in layman's terms it's not man, not woman. all man, all woman. >> reporter: it's all laid out in nico's new book "space between" a place, they say, where people who don't consider themselves "he" or "she" can call their own. >> and tell me the pronouns that you use? >> they them pronouns. >> and i may screw it up if i mess it up along the way. >> it's still a work in progress for everyone. i still mess up sometimes, too. >> what's the point of

. >> actor, author, and activist nico tortorella is showing the world how an unconventional relationship can reject both labels and monogamy. here's abc's juju chang. >> when bethany and i met in 2006, i was a boy, she was a girl, whatever that really means. >> reporter: this is not your typical boy meets girl love story. >> today bethany and i both identify as nonbinary and prefer they, them pronouns. >> reporter: actor nico tortorella and bethany myers are a uniquely modern couple. >> my wife, my husband, my best friend, my partner, my everything. >> reporter: both are gender fluid. their marriage polyamorous. redefining what it means to be husband and wife. >> in layman terms it's not-man, not-woman. all-man, all-woman. >> reporter: it's laid out in his new book "space between," a place they say where people who don't consider themselves he or she can call their own. nico revealing their painful struggles with coming out and facing their dark battle with alcohol. >> when i started having access to the party, to the celebrity, to the free everything, it got out of control. like it does