In the August issue of O, the Oprah Magazine, the talk-show host explains that some people misunderstand her close friendship with King.
"I understand why people think we're gay," she says. "There isn't a definition in our culture for this kind of bond between women. So I get why people have to label it — how can you be this close without it being sexual?"
In a long article, Winfrey, 52, and King converse about their 30 years of friendship and "four-times-a-day phone calls."
The two friends say they would have no problem telling the public if they were in a sexual relationship.
"The truth is, if we were gay, we would tell you, because there's nothing wrong with being gay," says King.
Says Winfrey: "Something about this relationship feels otherworldly to me, like it was designed by a power and a hand greater than my own. Whatever this friendship is, it's been a very fun ride."