Hey there. I have had this problem in the past, so i know where you are coming from. I have had a tivo for a while now and just got a new program from them called kidzone. It is wonderful. It not only allows us to block unwanted programming, but it also recommends additional family oriented programming. You should definantly check it out. Anybody having this concern would benefit greatly from this new program.
I got a tivo, i think it will help with the problem more so than a "vchip". I'm excited about it.
Thanks everyone for their comments, suggestions, thoughts and etc..