Is it permissible for a woman to waive her right to procreate to avoid problems that might arise if the first wife learns of her secret marriage, and is her marriage considered forbidden if she severs her lineage?

Procreation is one of the greatest objectives of marriage and a shared right between spouses. It is impermissible to prevent childbirth altogether. However, preventing it temporarily through methods like coitus interruptus (azl) or pills is permissible, so long as it does not result in harm or is not due to fear of poverty, though this is considered less preferable. Terminating procreation does not affect the validity of the marriage, as long as its pillars and conditions are met.