The Maltese Falcon
Amadeus
Clue
All perfect due to the cast and dialogue.
The Green Knight - the perfect movie for me. The first time I saw it I wondered who got inside my head to see what I liked the most and put it on the screen.
I had a fifth one but I can’t remember it right now.
Blade Runner (Final Cut)
Fargo
The Grey Fox
Harvey
The Secret In Their Eyes (the original 2009 Argentine film)
This sounds like a war flick to me, something I wouldn’t want to show a girlfriend to get her “in the mood.”
I once got laid after watching an Austin Powers movie on a first date. (Sadly, I don’t remember which one.) On another occasion, the British sitcom The Thin Blue Line did the trick (so to speak). 
Ahem, “Wings Of Desire” isn’t also exactly a “get laid to” movie. Yeah, love, human love is a main subject, but it’s not quite a romantic movie, but rather a sentimental one.
My five perfect movies:
Casablanca
American Graffiti
Double Indemnity
The Apartment
Some Like It Hot
So many others, but these were the first that came to mind.
So long as it isn’t a war flick, I’d put it on the program.
If we’re talking about “feel-good” movies for creating a romantic mood, I’m going to substitute Emma Thompson’s Sense and Sensibility for Double Indemnity. I used to show it to my EFL students every year around the March 8 holiday (International Womens’ Day).
I love Double Indemnity, but a watching a brutal murder is hardly the way to start a close relationship.
What’s funny is that although the film is not a war flick, it touches on WWII, as parts of it (and parts of the film within a film) were shot in a war ruin in which was West Berlin.
I see it’s available on-line for free, and Peter Falk is in it! I’ll definitely give it a shot when I have two hours to kill. 
I remembered what my fifth movie is: Dangerous Liasons. John Malkovich was born to play Valmont.
This gets my vote for being the only film I know of that features a typesetter, and discusses his work.