Inside a high-tech San Francisco swinger’s party

“We are in Silicon Valley,” says Stella, an engineer who attends. “People here don’t have a very high tolerance for bad websites.”

Stella has been with her husband, Greg, both engineers, for 10 years. They’ve been swapping partners for two of them.

“Whereas you might go to a bar, pick up somebody and take them home for the evening if you’re single, here it wouldn’t be unheard of to do that even if you’re married,” says Greg.

Factset: FactSet Research Systems Inc. 2015. All rights reserved.

Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved.

CNN Money