Whether you’re a theist or atheist, why would God/nature give women double pleasure, both internal and external, if sexuality was simply an animal act for procreation? Sex is God’s or Nature’s gift to mankind. How else can the “rational animal” survive in 30-60 year marriages? Ain’t easy but sex for bonding and pleasure helps get couples through some difficult times. Of course, that’s my opinion. Luckily we Americans enjoy the exercise of our right to privacy and choice of religion as well as opinion. Sex is good imho and good for us. I agree with moralists who decry that sex has become less a spiritual and happy union between people and moreso a hedonist and animal pursuit.
Contraception by its very definition denotes the BLOCKING or CONSTRICTION of something. So by its very nature, it is inherently disruptive of freedom, of the free flow or movement of something. It is an obstructive device impeding an act (sex) that was designed to glorify and make manifest total surrender, total pleasure, and total love.
Natural family planning, conscious abstinence (such as when a partner is sick or immobile for example) also fall under this paradigm of true, unrestricted life-giving love. And by life-giving, it doesn’t just mean babies, but the shared flow of life and energy between man and woman in marriage.