The natural end (or goal) of sex is procreation. It's the means we were given to accomplish the goal of repopulating our species. Contraception involves using the sexual faculty while actively frustrating the ends for which it exists. Ultimately, the argument for contraception boils down to pleasure. Why would we desire to have sex without the "risks" of conceiving a child if there weren't "something to gain"?
Paul gives another goal/end of procreation (i.e. to bind the husband and wife). There is much to gain in this.
To make sex only for the goal of procreation ... makes it particularly utilitarian ...
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