Ooooh, yay! I know what I'm listening to the rest of the day now!!
I could probably name about 100 of my "favorite" love songs, but here are just a few:
"Old Love," by a local husband-and-wife folk duo, Neal and Leandra (I want to make a photo montage to this song for my parents' 40th anniversary in a couple of years):
[YOUTUBE="http://www.youtube.com/watch?v=ZEllSVSl36c"]Old Love[/YOUTUBE]
"Parce ce que c'est toi" by French singer Axelle Red:
Parce que c'est toi je voudrais un jour un enfant... 

[YOUTUBE="http://www.youtube.com/watch?v=PVa7P0AnY2c"]Parce que c'est toi[/YOUTUBE]
Jason Mraz, "I'm Yours."

This is the song my husband and I danced our fist dance to at our wedding (a version close to this one, but without all the silly stuff

)
[YOUTUBE="http://www.youtube.com/watch?v=irSklXqsXBo"]I'm Yours[/YOUTUBE]
Pink Martini, "Let's Never Stop Falling in Love"
[YOUTUBE="http://www.youtube.com/watch?v=mPA3ZezYQJ4"]<3 <3[/YOUTUBE]