The difference between love and lust: "Love comes with open hands and open heart; lust comes with only an open appetite." Don't get me wrong, a physical relationship is important and it holds its place in love within marriage, but its how its used that defines "love", from "lust". My mother is a prime example of this. Two divorces and a lot of heartache between family members. She married twice for lust, the second marriage (first divorce) blew up because she wasn't "satisfied" anymore. She's since married again for the same reasons as before, but I know it will end the same way as the other.
The way I think of it, Love is pure caring, unconditional and to the point where you would do anything for the welfare of your family. It is unselfish, and always puts others before you. In a sense it is Charity, or the pure love of Christ. Look what he did for the WORLD, because he loved it so much. My mother professes she "loves" us, but after the display she made to me during the second divorce, I have a hard time believing it. She didn't care so much about what I thought, as what she wanted for herself. Open appetite, vs open arms.