Women are your fields: go, then, into your fields whence you please. (Quran, 2:223)
Allah’s Messenger said, “When a man calls his wife to satisfy his desire she must go to him even if she is occupied at the oven.” (Hadith - Tirmidhi 3257) Allah’s Apostle said, “If a husband calls his wife to his bed [for sexual intercourse] and she refuses and causes him to sleep in anger, the angels will curse her till morning.” (Hadith - Bukhari 4.460)
Allah’s Apostle said, “By him in whose hand is my life, when a man calls his wife to his bed, and she does not respond, the One Who is in the heaven is displeased with her untill he (her husband) is pleased with her.” (Hadith - Sahih, 2.3367)