Fitzgerald and Soldwisch both have friends of the opposite-sex and say it has never been a problem. Although the couple has not married, they remain committed and say they would never do anything to jeopardize the relationship.
Having female friends has "never been a problem," Soldwisch said. "They've been my best friends ... I've been fortunate to involve myself with confident women in my life."
"They'll always be temptation, but when you're in a true committed relationship, why ruin a great thing?" Fitzgerald said.
Harvey was surprised Fitzgerald didn't want to get married.
"I have no particular interest in being married," she said. "We don't need the piece of paper."
They do refer to each other as husband and wife, to make it "easier for the general public," Soldwisch said.
"I just don't know a woman who doesn't want to be married," Harvey said. "I'm stuck."
"GMA" also received hundreds of e-mails from viewers eager to join the conversation.
Angela McDaniel from Lufkin, Tex., wrote in about emotional infidelity.
"My husband has had several female friends that I didn't know about. If your spouse doesn't know about his friend then you are having an emotional affair! If you weren't there would be no reason to sneak & talk to the friend."
Brenda Velasquez from Modesto, Calif., says men and women can be friends without causing problems in their marriage. "Take me for an example. After my first marriage, we're still friends. In fact my ex-husband is renting a room from my current husband and me. In my opinion, it is just about how civilized and grown up you are in the situation and relationship."
Heather from Birch Run, Mich., e-mailed "GMA" to ask Harvey a question.
"My best friend is a male. We dated for a very short time several years ago right after high school. When my now husband and I started dating he knew about him and we hung out several times. But about two years after we got married my husband started making comments about him. Now every time we fight, he throws him up in my face. I have no clue how to get him to stop. Any ideas?"