Charney's lawyer, Keith Fink, said in a statement many of the allegations presented by the company were false.
"The company has engaged in an invasion of Mr. Charney's privacy in a shameful attempt to extort him and gain leverage over him," Fink said.
American Apparel's latest court filing presents previously undisclosed details of a misconduct investigation. The filing represents an effort, under California law, to prevent Charney from bringing future lawsuits against the company.
Company attorneys filed the court papers in Los Angeles Superior Court on Friday, the same day Charney opened a separate case by filing a $30 million defamation lawsuit against American Apparel.
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In their court papers, American Apparel attorneys said Charney violated company policies prohibiting harassment and retaliation against former employees.
"The company discovered voluminous evidence of Mr. Charneys sexual liaisons with employees and models," the company's court papers said, adding that at least one of these "numerous" encounters took place at his office.
Company investigators also discovered Charney had kept videos of these sex acts on a company server, the papers said. The company said he also sent employees emails with pornographic videos and photos, and accused him of using ethnic slurs against certain employees.
Charney had for years before his ouster faced highly publicized lawsuits accusing him of sexual harassment.
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Through September 2014, the company incurred $8.2 million in insured litigation costs and $1.2 million in uninsured costs due to Charney's sexual liaisons, court papers said.
Earlier this month, American Apparel was granted a restraining order against Charney preventing him, among other things, from making negative comments about the company in the press.