You know, while most people think that viruses and other computer nasties are really easy to get from porn sites, the evidence out there suggests that mainstream websites are much more likely to infect your computer. That said, it's still a good idea to keep on top of your device's health, which is why I recommend Adw Cleaner. It's a simple application just 2 MB in size that runs in a few minutes and basically searches for Adware, unwanted toolbars, browser hijackers and other types of adware that's not in the user's best interests to have on their computer.
Adw Cleaner has had 30 million downloads since it launched and updates regularly with new patches to keep on top of the enemies of your computer's health. Honestly, if there's any application you run between now and tomorrow, make sure it's Adw Cleaner. Free to use, simple to understand and it basically just makes sure no one is taking advantage of your computer.