Riyad Us-Saliheen (Gardens of the Righteous)

Chapter 335
Prohibition of Refusal by a Woman when her Husband calls her to his Bed

1749. Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (PBUH) said, "If a man calls his wife to his bed and she refuses, and thus he spends the night angry with her, the angels continue cursing her till the morning.''
[Al-Bukhari and Muslim].

Commentary:  It is incumbent on every women to respond to her husband's invitation to his bed for sexual intercourse. It would be a different matter if she has a lawful reason for it, such as observing an obligatory act of worship, like fasting during the month of Ramadan, illness, menses, etc. In such events she would be obviously unable to comply with the wish of her husband. But in the absence of any lawful reason, she would be condemned by the angels. This is emphasized on women for the reason that a husband should not ignore his wife and turn to some other women. If a woman fails to satisfy the sexual urge of her husband, he can go astray. It is, therefore, necessary that she should not show any slackness in complying with her husband's wishes.