I only posted that link here, because youtube is ignoring my flagging. For over two years a hardcore porn video is on youtube. And there are more!
Warning, these links contain explicit 18+ content:
http://www.youtube.com/watch?feature=player_detailpage&v=WkzQlTJx59E#t=142s
http://www.youtube.com/watch?feature=player_detailpage&v=_O-x9XjuxuU#t=240s
http://www.youtube.com/watch?v=oPHPwYgg-i0&feature=player_detailpage#t=142s

Please flag these as youtube doesn't remove these.