Chaz Bono: Sex change altered my relationship

For more than five years, Jennifer Elia stuck by love Chaz Bono through thick and thin.

Appearing alongside Cher's eldest child on Monday's "Oprah Winfrey Show," Elia admits "it was really hard" when her partner (formerly known as Chastity) transitioned from female to male.

PHOTOS: Famous Hollywood families

Added Bono, 42, who announced his momentous decision in June 2009, "We had to really almost re-learn how to communicate and how to be around each other."

"Things had changed," said the author. "Just me saying the same thing that I would have before with a deeper voice and more of a presence."

PHOTOS: Cher and other celeb Barbies

"Testosterone," Winfrey chimed in.

"Right," Elia said.

"Suddenly [things] didn't mean the same thing to her. And so we really had to, you know, adjust our — how we did things and relearn how to be together."

PHOTOS: Cher and other sexy 60-plus stars

The famous kid of Cher and the late Sonny Bono also tells Winfrey that the Hilary Swank film "Boys Don't Cry" — about a biologiocal female who yearns to be male — inspired him.

"The Oprah Winfrey Show" airs Monday (check local listings).