Oprah Winfrey dedicates show to Rihanna

Oprah Winfrey dedicated her talk show Thursday to Rihanna , US reports : "If a man hits you once, he will hit you again."

"I've said before, love doesn't hurt," she said during a discussion with Tyra Banks about dating violence.

Banks -- who has interviewed both Chris Brown and Rihanna separately on her talk show -- recalled how the two talked to her about their unhappy childhoods.

"Rihanna told me that her parents used to argue so intensely and she used to get these headaches, almost migraines ... and it was almost living hell for her," Banks said. "The moment her parents separated, the headaches went away."

Banks also said that Brown witnessed a man abuse his mother. Scarred by the incident, he used to wet the bed, Banks said.

"It's so sad that even when you grow up in an environment and you disdain that environment, you really cannot help yourself until someone helps you," Winfrey said.

Added the talk show host, "When you grew up in an environment where there is abuse, it's more acceptable to you. If you go back with a man who hits you it's because you don't think you're worthy of being with a man who won't."