Dictinary.com defines love (noun usage) as the following:

1. a profoundly tender, passionate affection for another person.

2. a feeling of warm personal attachment or deep affection, as for a parent, child, or friend.

3. sexual passion or desire.

4. a person toward whom love is felt; beloved person; sweetheart.

5. (used in direct address as a term of endearment, affection, or the like): Would you like to see a movie, love? 

6. a love affair; an intensely amorous incident; amour.

7. sexual intercourse; copulation.

8. (initial capital letter) a personification of sexual affection, as Eros or Cupid.

9. affectionate concern for the well-being of others: the love of one's neighbor. 

10. strong predilection, enthusiasm, or liking for anything: her love of books. 

11. the object or thing so liked: The theater was her great love. 

12. the benevolent affection of God for His creatures, or the reverent affection due from them to God.

13. Chiefly Tennis. a score of zero; nothing.

14. a word formerly used in communications to represent the letter L.

   This definition encompasses sex, romance, passion, communications, mythology, and affection.  The very things used by the rest of us when trying to explain and define love in the written form.  It doesn't work folks.  Movies, TV, blogs, books, articles, and songs can not convey what love is.  Until you're in it yourself, you don't know what it is.  When you're in it, you can not accurately describe what it is.  When you fall out of it or chase it away, you are too broken to recant it.  It is an indescribable emotion that always falls short when written down, put on film, or sung about.  People will continue to try and do it (I'll be the first to try), but, as always, the description will fail.  You see love is different for everyone.  No one has the exact same idea as the next person.  That's what makes love so incredibly wonderful and difficult.  You can not put love in a box, a blog, a movie, or a song because it will die.  

On a side note, Erich Segal may have written it best with Ali McGraw having uttered the line the best "Love is never having to say you're sorry."