Your kids need internet access to do their homework, but that doesn’t mean you’re comfortable with them accessing everything online. There’s no technological substitute for proper adult supervision, but a free service called OpenDNS Family Shield makes it easy for parents to all block adult content with one simple tweak.
If you want a little more control, you can set up an account for OpenDNS Home Internet Security and block adult content alongside things like malware and piracy sites. This option means setting up a free account and a few extra configuration steps, but gives you a lot of control over which sites are blocked and which are allowed. The downside: it only works on your home network, so it’s not useful for mobile devices like Family Shield is.