Oprah's Aha! Moment with NPH & David Burtka

Oprah had another one of her trademark "Aha!" moments while visiting with Neil Patrick Harris and his partner David Burtka, as they explained the journey of a same-sex couple wanting to be parents.

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"We really had thought it through financially, emotionally, relationship-wise. We didn't just accidentally get pregnant," said Neil who, with David, is a father to 18-month-old twins Gideon Scott and Harper Grace. "These kids come into our world with nothing but love."

This sparked Oprah's epiphany that -- unlike some traditional pregnancies -- with same-sex couples, having a baby doesn't happen by accident.

"I never thought of it that way before," said a misty-eyed Oprah.

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Watch the entire exclusive interview on Oprah's Next Chapter, airing June 3 on OWN.