Sometimes it is hard to definitively identify whether a song is or isn't a love song. Billboard has skipped the tough decision by publishing their list of the top fifty songs with some form of the word "love" in the title.

This, of course, creates its own whole set of problems as not every song with "love" in the title is actually a love song. For example, Sara Bareilles' Love Song (number 50 on the list) is really a kiss-off to her record company who wanted her to write that one hit single.

Billboard's list is topped by Diana Ross and Lionel Richie's 1981 hit Endless Love from the movie of the same name. The song spent nine weeks at the top of the charts during a time when records very rarely attained such lengths at number 1.

That's why the next two songs on the list, Boyz II Men's I'll Make Love to You (1994 / #1 for 14 weeks) and We Found Love by Rihanna Featuring Calvin Harris (2011 / #1 for 10 weeks) are lower than the Ross/Richie classic.

The following are the top twenty. To see the whole list along with commentary and audio for each, go to Billboard:

1.Endless Love - Diana Ross and Lionel Richie
2.I'll Make Love to You - Boyz II Men
3.We Found Love - Rihanna Featuring Calvin Harris
4.How Deep is Your Love - Bee Gees
5.Silly Love Songs - Paul McCartney and Wings
6.I Will Always Love You - Whitney Houston
7.Let Me Love You - Mario
8.Because I Love You (The Postman Song) - Stevie B
9.Best of My Love - Emotions
10.I Can't Stop Loving You - Ray Charles
11.Bleeding Love - Leona Lewis
12.My Love - Paul McCartney and Wings
13.Because You Loved Me - Celine Dion
14.Crazy Little Thing Called Love - Queen
15.To Know Him Is To Love Him - Teddy Bears
16.Love is Blue - Paul Mauriat
17.Woman in Love - Barbra Streisand
18.Love Takes Time - Mariah Carey
19.It Must Have Been Love - Roxette
20.Vision of Love - Mariah Carey

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