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Tesla billionaire Elon Musk had quite the look at venture capitalist Steve Jurvetson’s alleged “sex party,” according to Emily Chang’s new book “Brotopia.”

Chang writes that in private Facebook photos from the party, Musk “appears wearing a black armor-like costume adorned with silver spikes and chains.”

Also at the 2017 bash was Google head Sergey Brin, “bare chested in a vest.”

The theme was “Edge of the Earth.”

Musk’s rep previously told Page Six: “Elon was at the . . . party for a couple hours and left around 1 a.m. . . . His impression was that it was a corporate party with a costume theme, not a ‘sex party.’ ”

Jurvetson has since been ousted from venture capital firm DFJ over sexual misconduct allegations, which he denies.

A rep for DFJ reportedly said they were “dismayed to learn of behavior at the party that was completely at odds with DFJ’s culture, which has been . . . built on the values of respect and integrity.”

In the book, out from Portfolio, Chang also writes about a San Francisco jiggle joint, Gold Club, where a dancer said many high-powered techies from Apple, Uber, Twitter, Dropbox and Airbnb frequented the place during lunch.

“Yelp employees call this place ‘Conference Room G,’ ” said the dancer.

A female CEO added she was taken there at the end of a job interview.