What is the ruling on using birth control pills and similar contraceptives, and what is the ruling on a wife refusing to conceive when her husband requests it of her?

It is permissible to use contraceptives of all types, provided that they do not cause harm to the woman, that it is with the consent of both spouses, and that there is a need for their use, such as the mother's exhaustion from successive births, and that the intent is not to cut off progeny entirely.