Whether it’s your home or your work network, it’s always a good idea to block material that should not be viewed. And the best way to keep such material off your screen is to block it before it even gets to your router. A great resource for doing just that is OpenDNS. You can find a guide to setting things up here. I recommend blocking things at the router level, but that can be a bit more complicated. Setting it up on a computer-by-computer basis is not difficult, though, so it’s your choice. Regardless, it’s worth the time to do it!