wow some of u are very strick ..
I don't think I will limit them to only videos and pre screened .. but will train them to stop watching or change channels if nakedness, sex, kissing wissing comes .. one day they will be old and might be home alone, so they will know its not appriopate to watch such programmes, something like their consciouess will tell them .. mama told u to switch channels .. my parents did this with us and we watched appriopate programmes.
I guess you are missing the point (or i m missing something?) . Point is to change your habits instead of telling your kids to "go to other room coz its not good for kids"....