Earlier this year, naked photos of Hollywood starlet Scarlett Johansson made their way onto the Web. The photos, which Johansson had taken herself with her smartphone, were posted on a variety of different sites, and then went viral. It’s called “sextortion,” and it’s exactly what it sounds like: sexual extortion. It all begins when someone gets their hands on a racy photo of you. So how do you protect yourself from sextortion? Well, there are a lot of little things you can do.