I think of sex as the icing on the cake, the cake being the relationship.
While cake is sweet in and of itself and often good enough, a bit of icing can make a plain old cake into something delicious and decadent.
I won't say I can take it or leave it... For me sex inside a relationship is pretty darn important. Not because of the momentary pleasure, but because its a total giving of ones self to that very important person in one's life. I also view sex as being a form of intimacy not something that one has with just anyone.
This isn't to say I think about sex all the time
often it isn't 100% a necessity in my daily life. The last relationship I was in I thought we were both monogamous, and due to his status (HIV+) I accepted the last decade + without sex as part of the complexities of that relationship.
Its that cake and icing thing... I thought I had a really good cake... Yeah sure, icing would have been nice but it wasn't a must have.
My priorities with a partner are slightly different. If my partner wants sex I can turn of the computer/tv/radio whatever like that and happily oblige. I do understand that kids, job, daily life can get in the way... to a point. And I do hope that my partner will get off of WOW when I get in the mood....