Silicon Valley male executives appear to be as raunchy as college frat men.

This was what surfaced at the Thursday hearing of the US$16-million gender discrimination case that former Kleiner Perkins Caufield & Bayers junior partner Ellen Pao filed.

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USA Today reports that the male executives engaged in locker room talk despite the presence of Pao while they were traveling on a private plane for New York in 2011.

On board the jet were Pao, several Kleiner partners and Dan Rosensweig, CEO of Chegg, a textbook and learning site that Kleiner invested in.

According to Stephen Hirschfield, an investigator who testified on Thursday, Pao said that the male executives' talk centered on hot porn stars, dating younger women and good clubs to go.

Hirschfield was hired by Kleiner to probe the charge by a firm partner that another partner pursued her.

Rosensweig also allegedly said he wanted to bring then Google executive Marissa Mayer to the board of Chegg because she was "really hot." Mayer is now Yahoo CEO.

When Hirschield finished the first investigation that involved a male partner, Ajit Nazre, who had an affair with Pao, he was also asked by Kleiner to investigate Pao's charge that the firm has a gender bias.

While Therese Lawless, the defense lawyer, painted a picture of Kleiner as paternalistic or do not know how to deal with female workers, John Doerr, a senior partner of the firm, said he felt then that Pao had "a female chip on her shoulder."

Hirschfield also told the court based on what Pao, now the interim CEO of Reddit, told him that Kleiner partner Randy Komisar said the company is a boy's club.

Kleiner partner Juliet de Baubigny likewise told Pao that females lack the personality traits to succeed at the company and Doerr remarked to another partner, Ted Shclein, to make another male partner wear a skirt in response to Schlein's observation that Kleiner needed more women workers, the investigator told the court.

Tagsgender discrimination, ellen pao