The Postman Always Rings Twice{1981}
The sex scene in the kitchen and the one where they do it on the hill.

anyone know a Latina nun provider with dimples?

This isn't really a sex scene per se, but it is a scene that is enough to make me weak in the knees LOL.

In Spiderman (the first one) the scene where Kirsten Dunst is chased down an alley by a bunch of thugs, and Spiderman comes to her rescue. It is pouring down rain in the scene, and soon Kirsten's dress is completely soaked. While Spidey kicks bad guy butt, Kirsten is standing there and her dress is so soaked that her breasts are perfectly detailed and outlined.

Without seeing any skin whatsoever, you can tell exactly what her breasts look like, and my God she has absolutely perfect ones. The fact that they are covered yet so completley revealed is incredibly erotic to me. It is the tease of exhibitionism coupled with demure concealment that to me is incredibly hot.

Ok, so I'm weird

he's fingering her and then DATY while she gets so aroused and hot...

Risky Business- The scene on the train.  
I am not a big Tom Cruise fan but Rebecca Demorney is sooo sexy

Maybe betther than some porn lesbian scenes

I go to mainstream movies for entertainment and escape. I haven't received titillation from a movie rated by the MPAA in 15 years.

If it's titillation I seek I'll rent a title like
"Back-Door brides" for my home viewing pleasure; expecting it from mainstream movies is like trying to get real pain relief from chewable children’s aspirin.

In Body Heat, the scene where William Hurt tosses the chair through the window and bangs Kathleen Turner on the floor.

Also, in the movie Porky's where he bangs Kim Cattrall in the laundry room.  She was soooo freakin hot back then. (still pretty hot today too)

This David Mamet screenplay that followed the novel and 1946 movie. When Jack takes Jessica Lange on the kitchen table, I about lost it in the theater. What a hot scene.