The custody dispute between Charlie Sheen and Denise Richards intensified Wednesday after the actress asked a judge to protect their children from her ex-husband.

Sheen angrily responded, saying that Richards "behaves as though she owns our children. She does not. A day of legal reckoning for her is fast approaching."

The latest scuffle in the battle between Sheen and Richards over daughters Sam, 3, and Lola, 2, began with the actress's Superior Court filing.

The document was not yet released, but her attorney said that Richards is seeking "the assistance of the court to obtain orders to protect her children" from Sheen.

"She believes that Charlie has significant personal issues which he has failed to address and which require her to take action to protect her children," says lawyer Neal Raymond Hersh. "This is not a vindictive action. Any responsible parent in Denise's shoes would go to the ends of the Earth to protect her children."

Her lawyer didn't state what those "issues" were.

But in papers obtained by Access Hollywood, Richards accuses Sheen of "inappropriate behavior ... and conduct," including "his attraction to underage women and his sexual explicitness on the Internet, including revealing his private parts." Richards seeks to stop Sheen's overnight privileges with their daughters.

Sheen countered by releasing a statement: "Clearly the mother of my children has no interest in responsible co-parenting when it comes to my relationship with our girls. "

He added: "The truth will prevail. It always does."

Sheen, 41, and Richards, 36, exchanged legal blows last month, when Sheen filed a request to family court asking that he be allowed to select his own child care providers, and that Richards cease her "unnecessary phone calls."

Richards filed for divorce from Sheen in March 2005, when she was six months pregnant with their second child.

In November of last year, a court legally ended their status as a married couple; however, their divorce is not yet complete. Still at issue is the final division of assets and custody arrangements over their daughters.