I asked Mayer if he believed there was reason to worry that one’s porn-browsing history could be sold — say, to a potential employer — or made public. “I’m not aware of any company intentionally doing either,” he said. “But it’s just one rogue employee or data breach away.” The recent revelation that the NSA spied on Muslim “radicals’” porn-viewing habits with the plan of using that information to discredit them makes the threat seem all that more real. “The NSA gets most of its data from private companies. They’re the start of the surveillance supply chain,” said Downey. “It might start with quote-unquote radicals, but it could go to any one of us.” So should you worry about your porn being tracked? Yes. There is plenty of reason for concern. But remember that ad trackers aren’t just on porn sites — they’re on social networks, financial websites, medical forums, you name it. In fact, an Abine study found that porn sites had fewer trackers than almost any other categor...