Oden says the pictures, taken with his cell phone and sent to a former girlfriend, were taken about 1½ years ago. A friend told the 21-year-old Tuesday morning that the pictures were making the rounds on the internet.
"I would like to apologize to everybody: Portland, the fans, the organization," Oden told reporters at the Blazers practice facility. "It was very embarrassing."
Oden is out for this season after fracturing his left kneecap during a game against the Houston Rockets on Dec. 5. He averaged 11.1 points and 8.5 rebounds in 21 starts.
The 7-foot-center was the No. 1 pick in the 2007 NBA draft out of Ohio State. He missed his rookie season after have microfracture surgery on his right knee.