There are a few things you can do to completely keep your son from looking at any further explicit or inappropriate content. Create a Google account (if you do not have one), make sure you are signed in, then go to the following link http://www.google.com/preferences . Once you are there, you will see a list of settings, but the one you are looking for is the first one right at the top called 'SafeSearch Filters'. Check the box that says 'Filter Explicit Results'. Then click Lock SafeSearch, this securely locks that setting, and once you log out, the setting cannot be changed UNLESS you are logged in, so it is very crucial that you always log out of your google account, and that you do NOT have your sign in information where your son can find it (on a piece of paper, a document on the computer, etc.). SafeSearch filters out all bad and nasty results, whether if your son is searching for pictures, a specific website, or some videos. Anything that has profanity, drug influences, or explicit content in it, will not show up in the results at all. So if your son for example searches for "porn videos", nothing at all will show up. Not only will it filter all search results on google, but since google owns youtube, if your son wants to listen to rap, he can't, because all videos with profanity or bad influencing lyrics, will NOT show up in the search results. Another thing I highly recommend, is to make a completely different account for your son only, so that you will not have to worry about your son possibly messing up your account, and possibly discarding special and crucial documents or files. All you need to do is to make another account, set up a password for him, go to google, sign into your account so you can lock safesearch, then log out, and you have nothing to worry about. If your son knows the password to the current account, then I highly recommend for you to change it and to make sure he will not in any way find out what it is (if you are going to make a separate account for him). Your son unfortunately has been drawn into watching such things, and it is either because of flashy ads, or he was influenced by someone online or by someone in school. Regardless of what the cause may be, I highly recommend for you to add the AdBlock Pro extension when you are logged in to google, this extension completely makes ads no longer visible and does not let them appear on any site whatsoever. This will be an added security measure to keep all further possible influence away from your son. Also, look EVERYWHERE on your computer to make sure that your son has not downloaded any videos or pictures of pornography. My best advice to you, is to set up a meeting with your former church bishop or counselor, and for your son to have a long talk with the bishop/counselor. As you may know, there is no guarantee that him having a long talk with the bishop will have him notice what he is doing is wrong and unethical, but at least give it a try. Please do ignore all the people that have said that there is no way to stop him, or that you should keep letting him do it. There is always a solution for a problem, but not many people tend to think that way