I am sure you've heard this before, but I'll say it again because it's true: having a romantic date night can do wonders for passion and desire in a marriage.  If you are stuck in a rut in your marriage, then you know what it's like to always be inundated with the business of life.  Every day is the same old routine.  You may remember what it was like when you had time to spend with your wife just to enjoy her company - when you wanted to romance her.  You may wonder what happened to those more romantic times.  She is probably wondering the same thing.  And without that one on one romance time, passion and desire go south for the winter.

So at all costs: create a romantic date night.  It may only be once a month - and if you're lucky it'll be once a week.  But it needs to happen.  Have the kids go to a sitter or to Grandma's or to a friend's house.  You just need 3 or 4 hours together. 

Get out of the house.  Go out to a romantic dinner.  Go sit on an overlook and look at the city lights.  Go star gazing.  Go for a long walk.  Go play mini golf. 

I suggest something where you can be together and pay attention to each other with no distractions.  You could go to a movie, but your minds will be focused on the screen, not each other.

If you have time alone for romance with each other - away from the house - your relationship can have time to grow.  Without that time, you can become mere acquaintances with mutual household responsibilities.

Grow your relationship with each other by setting aside quality romance time together and you will also see your passion for each other grow.  And your wife's libido will grow as well.