I've seen the movie Baise-Moi, which is pretty bad itself
http://www.imdb.com/title/tt0249380/
But rent it if you want to watch porn with the wive without her knowing about it ;) There ARE hardcore scenes in this movie and those are real porn actresses doing a real movie.
But my biggest surprise was probably the movie Aphrodite starring Valerie Kaprisky, the movie is pretty dull, but you never expect it to turn into a porn movie at the end...!!!!
http://www.imdb.com/title/tt0083572/
I've also seen "In The Cut" with Meg Ryan, this one has a blow job as well. The movie is not that good and seriously, the cop is ill ;)
I'm not agaist having real sex in a movie, however it should not be the center of attraction of the movie.. but do we need this? We don't need nudity as well, I doubt it would change the movies if there wouldn't be nudity or sex in them.
If you want sex, rent porn, or do better porn ;)