Here is what I've gotten so far:
Greeting +2:
Looks Nervous - Hug
Looks Happy - Kiss on Cheek
Looks Hot - Kiss on lips
Gift+1:
Teddy - Always
Movie+1:
Something Fun - Meet the Sisters
Something she likes - The Notepad
Someting Exciting - The Crawling Dead
Snack+1:
Cold & Sweet - A chocolate Icecream
- A hot dog
Sweet & Crunchy - Sugared Popcorn
Salty & Cruchny - Some Nachos and Cheese
Drink +1:
- A bottle water
Cold and sweet - A coke
Warm and Sweet - A hot chocolate
Surprise - A glass of wine
Movie (Phrase after "Whats up?") +1
The Movie is great! - Its great
What do you think? - Looking at you
- Boring
Kiss +1
Touch Leg +2
From what I can tell there is little to no difference between a 9 and 10 heart date aside from the achievement, but as of now I've 100% the game.
Also I found a strange bug, if you call Ashley from the map screen the map icons don't go away when you go to the next scenes. Hope this helps!