Her husband
doesn’t pray and she is withholding from having intercourse with him
Question

                My husband doesn't pray 5 times a day and
      constantly, I have encouraged him to do so with no avail. Since he hasn't taken heed of my
      requests I have withheld myself from engaging in intercourse with him. He exclaims that my
      actions are inappropriate, saying that it is blasphemous for me to use prayer as an
      incentive for intercourse. Is he correct?
Praise be to Allah.It should be known that the one who does not pray any of
    the prayers and persists in not doing so, according to the Sahaabah and the majority of
    scholars, is counted as a kaafir and it is not permissible to marry him or eat meat
    slaughtered by him. If the husband does not pray at all, then he is taking a very serious
    risk and it is not permissible for you to stay with him. You have to remind him and scare
    him with this. Withholding yourself from having intercourse with him is the right thing to
    do, until he starts to pray, because the one who does not pray is counted as a kaafir, as
    it was reported in Saheeh Muslim from the hadeeth of Jaabir that the Prophet 
    (peace and blessings of Allaah be upon him) said: 
All that stands between a man and shirk and kufr is his giving up
    prayer. And he also said:
The covenant that separates us from them is salaah, and whoever
    gives up prayer is a kaafir.
Abd-Allaah ibn Shaqeeq said: the companions of the Prophet 
 (peace
    and blessings of Allaah be upon him) used not to count the giving up of any action as
    kufr, apart from prayer. You have to warn your husband against neglecting the
    prayer. If he persists, it is not permissible for you to stay with him because you are a
    Muslim and he is something else. May Allaah help the Muslims to do what Allaah has
    commanded and to obey Him. You have to advise and scare him, and may Allaah bring about
    good for him through that.