I actually love ambient music, it just really relaxes me. I'd say "Angels" by The XX. It also depends on who I am with because sometimes you just want to go wild and listen to hardcore rock or you may want to go nice and slow with some R&B.

The thing I like about you
Is the way you
The way that you do
The thing I like about you

God and the devil alone
Could not have made you up
The two must have worked
As one together

So good just wanna eat you up
Nothing like the real thing
Lick your sticky fingers boy
And sing for your dinner sing

Come on pretty baby
Make me lose my mind
Everybody get together
Gonna make love shine

Do you know what it is
To feel the light of love inside you?
And all the darkness falls away
If you feel the way I feel
Then believe we have the answer
I've been searching for tonight
Love me baby love me baby
Shake me like a monkey baby
Forever  

I like my coffee with toast and jelly
But I'd rather be licking you
From your back to your belly

Cigarettes and coffee
Broken hearts and being lonely
Little girls and ponies
Things that go together

Yes and no
You have to choose
Romeo and Juliet
The hang man and his noose
You and me we go good together

Kiss kiss make a wish
Hope that it comes true
I ain't waiting for the world to change
Gonna change the world for you

Come on pretty baby
Make you lose your mind
Everybody get together
Gonna make love shin

eg
sweedish house mafia tiesto

Nothing like some good Zepplin playing Kashmir

It's a good question - I personally don't care what is playing.  I focus on the moment and try to connect with the person I'm with

I found this study to be interesting

http://www.jstor.org/stable/10.1086/665048

"a moderate level of noise induces a moderate level of arousal,"
http://www.coffitivity.com/

Anyone up for an experiment?