For me love and friendship, companionship, soulmate is the most important sex is important but it's not as a big priority as the first three. Some people tend to get sex mixed up with love. When you're mate gives you no respect or if both stop trying to make one another happy then it's basically over. Hopefully you can remain friends after that but most of the time not.
I think this song can apply to both men and women
Here's Your Song Enjoy >>
The Pretenders - Thin Line Between Love And Hate (Remastered)
http://www.youtube.com/watch?v=jlAcYJw6hHM