That is exactly why i dont use display. Eventually you can set reach with frequency set to 1 and lowest cost per view possible. And each our ban all junk. There is a lots of it, so it is impossible to remove all. But after two, three days, you get a nice list of websites where actually you want to display ads. Than you can show ads only on these pages.

Other way is to use keyword setting. Not as topic or observation, but page containing a keyword. With good set of keywords it is possible to rule out baby clicks