(Credit: AP) While issues of sexual harassment and the gender pay gap are widely discussed in relation to Silicon Valley, a new article adapted from a forthcoming book is putting the spotlight on another side of gender and tech: sex parties. Emily Chang’s “Brotopia” details the exploits of the men in Silicon Valley, while also looking at the origins and impact of the sex-and-drug fueled culture. For the book, Chang spoke with more than two-dozen people about the parties.