I almost forgot this great scene from The Basic Instinct!
http://www.xvideos.com/video127571/j...horn_sex_scene
As mentined, 9 songs also looks very explicit, never seen that one though
http://xhamster.com/movies/163376/9_songs.html
And.. of course, probably all films from Tinto Brass:
Fallo
http://video.xnxx.com/video325140/fallo_
Cheeky (cant find a single clip for this one)