Question 8: I have been married for thirty seven years now. I refrained from having intercourse with my husband eight years ago and started to mistreat him. What is the ruling on this act?
Answer: A wife is obliged to honor and treat her husband kindly seeking to please Allaah. It is impermissible for her to refrain from having intercourse with her husband unless she has a Shar`ee (Islaamically lawful) excuse… read more here.