Wife not interested in intercourse
Question

                I've married 4 years ago, and I have a 3 years old
  daughter.  My wife is not interested in sex at all.  We've tried several doctors
  but [with] no progress.  I do masturbate a lot, which caused some bad effects but I
  can't stop as we live in Canada, where you can't marry more than one wife.  Is this a
  good reason to marry a second wife, or is there any other solution to my problem?
Praise be to Allah.Arabic Answer in audio: Real Audio format -- Press here to play
(To download player, click on icon: )
English translation:
, and peace and blessings be upon His
Messenger.
I ask Allaah to help you, my brother, to cope with this
problem which you are suffering from, and which has to do with the mother of your
daughter, the closest of people to you.
I would like to make three points to you:
You are permitted to enjoy your wife in any of the ways which Allaah has
    permitted to you. This includes masturbation by her hand.
The reason you have mentioned in your question is sufficient grounds for
    taking another wife.
If you can find no other solution to this problem except divorcing this
    woman, between whom and you there is no longer any relationship in the marital bed, and
    marrying another woman afterwards, there is nothing wrong with that, in shaa' Allaah. You
    should consult the brothers around you who know your situation, and seek the guidance of
    Allaah by praying istikhaarah. May Allaah guide you to the right way.
May Allaah bless our Prophet Muhammad.