(CNN) -- A new study finds nearly a quarter of malware on mobile devices comes from porn websites.
The study was conducted from Blue Coat, a Web security and optimization company. Mobile users don't check out porn sites; often, less than 1 percent of all mobile traffic is pornography.
But when they do go to those sites, the risk of inadvertently downloading malware to their devices increases three-fold.
That makes watching porn on smartphones a far bigger threat than viewing porn on a PC.
Porn led to more malware on smartphones and tablets than e-mail spam, malicious websites and fake apps combined.
