Chaz Bono: Hormones Spiked My Sexual Appetite

5/9/2011 3:14 PM PDT

[VIDEO] Chaz Bono -- Hormones Spiked My Sexual Appetite

Chaz Bono is opening up about his difficult journey of physically transitioning from a woman to a man -- confessing he remembers virtually nothing from his childhood.

In the documentary "Becoming Chaz" ... Bono talks about the increased sexual appetite he gets from hormone injections.

Chaz nervously admits he doesn't remember anything about the early years ... adding, "I was just thinking about 'The Sonny and Cher Show' ... you're not thinking about reality."

"Nightline" will air clips tonight on ABC ... and the full documentary premieres Tuesday on OWN at 9PM.