Free Porn! website interrupts other users in home?

So we have router & desktop computer plugged into cable box. When desktop user, who is cheap, went on Free Porn! site some of us lap-top users lost access to some sites we had open on our lap tops &/or cell phones. I got desktop user to leave Free Porn! site `& for good measure turned off desktop. Why... show more So we have router & desktop computer plugged into cable box. When desktop user, who is cheap, went on Free Porn! site some of us lap-top users lost access to some sites we had open on our lap tops &/or cell phones.
I got desktop user to leave Free Porn! site `& for good measure turned off desktop.

Why dowebsites, (Youtube, Yahoo, etc.) become unavailable when Free Porn! websites are being used? Do I need a better router or possibly find a way to make Free Porn! no available on desktop computer?
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