Women are made to be mothers. The purpose of sex must be for reproduction, so when a woman engages in sexual activity, she must not allow any contraceptive method to interfere with the eventual goal of creating a baby.
This life-giving purpose that women have been gifted with is a fundamentally good thing. Therefore, women who intend for their partners, or themselves, to use contraception are engaged in an intentionally ‘anti-life’ act as they want to prevent a new life coming into being.
They, therefore, have a bad intention that goes against their natural purpose of becoming mothers, and it is always wrong for a woman to push away her natural maternal instincts and purpose.