I'm not a lovey-dovey person, but here's some intrinsically great songs that happen to be love songs:
1) Strangers in the Night
2) Try and Remember from The Fantasticks
3) A Whole New World from Aladdin
4) Can You Feel the Love Tonight? from The Lion King
5) The one that goes: "I love you, always, forever, near and far, closer together everywhere."
6) My Heart Will Go On

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"Carl Sagan sent a message to ET,
Neil Armstrong walked in the Sea of Tranquility
Steve Squyers built Spirit and Opportunity
Dan Haylen upchucked in zero gravity." -Brent Simon, The Space Camp Song