The Girl Next Door

xinxy is definitely right. The song that plays when they are having sex in the limo after prom and when he moves in and kisses her for the first time at the party is "This Year's Love" by David Gray.
here is pretty much all the songs in the movie. im not going to take credit for it though because i got it from someone else.

Intro - David Bowie w/ Queen - Under Pressure
Matthew gets into Georgetown - Elliot Smith - Angeles
Matthew goes to the beach - Paul Haslinger - Carpe Beachum
Matthew sees Danielle first time - Echo and Bunnymen - The Killing Moon
Sees Danielle through window - Paul Haslinger - Peeping Matt
Matthew running ***** - Harry Nilsson - Jump Into The Fire
Matthew and Danielle in cafe - Thunderclap Newman - Something In The Air
Driving home from cafe - Score
Matthew sees Danielle outside school, bails on class - Filter - Take A Picture
They go swimming - Score (Sounds like Paul Haslinger - End)
Tripod w/ Danielle walking to party ("I declare war on stupididty...") - Overseer - Slayed
Matthew feels out of place at party - Score
Matthew decides to kiss her - Dilated Peoples - No Retreat
They kiss at party - David Grey - This Year's Love
Matthew struts through the hall at school - Sloan - If It Feels Good Do It
Minions video mascot in studio - Fantastic Plastic Machine - Electric Lady Land
Porno film - ????
Matthew thinks about Danielle - Score
Matthew things about Danielle w/ his parents - Porno Sonic - **** Dagger's Theme
Before they get to the hotel - Paul Haslinger - Plan
In the hotel - Score (Might be on the end of "Plan"?)
After Matthew takes her to hotel - Satchel - Suffering
We see Kelly for the first time - Youth Of Today - Break Down the Walls
In the strip club - Monster Magnet - Dopes To Infinity
In the strip club - Sneaker Pimps - Spin Spin Sugar (Radio Edit)
Matthew gets a lapdance (lyrics like "Work it") - Pepe Deluxe - Big Muff
Old *** ed video - ????
Kelly leaving the girls wanting more - heavy rock song
Danielle leaves for Vegas, Tripod talk in cafe - Red House Painters - Song For a Blue Guitar
Heading to Vegas - 2 Unlimited - Twilight Zone
Inside AVN convention - Methods of Mayhem - Get *****
Matthew sees Athena - Looper - Mondo '77
Party at the convention at 2am, after Kelly shoves Matthew - Ralph Myerz and the Jack Herren Band - Think Twice
Running from Mule - BG The Prince of Rap - This Beat is Hot
Gives her picture she drew - Pete Yorn - Turn Of The Century
Will you go to prom with me? - Piano music
Kelly drags Matt out of school - Bass sounds like "Hey man nice shot" by Filter, but guitar is different. Heavy guitar.

Kelly and Matt talking in car - Score
Bird chases Matt, Matt goes to the dinner - James Gang - Funk #49
Matt sees competition - Frederic Chopin - Nocturne No. 2 in E Flat Op. 9 No. 2
Matt tripping at competition - Pati LaBelle - Lady Marmalade
Matt's speech about Danielle - Score (I think)
Matt loses scholarship - Mogwai - Christmas Song
Kelly driving away with money - Sweet Home Alabama
Matt finds out money is gone - Paul Haslinger - Bankmeltdown
Pornstars arrive at airport - Marvin Gaye - Whats Going On?
Prom dates - Muddy Waters - Mannish Boy (NOT Hoochie Coochie Man)
Porn stars kiss in limo, walking into prom - Groove Armada - Purple Haze
At the prom - NERD - Lapdance
Danielle and Matthew are dancing - The Verve - Lucky Man
Matt thinking about being in last scene - Score
Flashback thinking about Danielle - Josh Rouse - Sparrows Over Birmingham
Leaving prom in limo - Donovan - Atlantis
Matt and Danielle in limo - David Grey - This Year's Love
Lost the tape - Score
Ending - The Who - Teenage Wasteland (aka Baba O'Reily)
Credits - Binocular - Maybe You're Gone
Credits - Alastair Binks - One Fine Day