All time greatest love song?

What do you think is the all time greatest love song? plz only list 1 favourite, if your first choice has been said plz chose another!donald s.. the reason for answering it is so i can get a borad spectrum of what songs people think are the all time greatest.. your opinion would have been vaild .. i wanted to create a cd, but its hard to pick songs.. so i thought id get the yahoo community to do it!
Answer
Whats the point of answering this as e body will have a different one and different reasoins.ok if you read this again my answer was actually a joke as in whats the point. however the only one i can think of is who needs tonight we got tomorrow by curtis steigers i think. i always go by the tune byut sometimes the words.