Casti Connubii does repeat several times that the conjugal act is intrinsically tied with procreation:

The power of love between spouses is said to both lead to and be nourished by the moral use of the conjugal act.

That healing is a process realized in conjugal acts.

It offends against chastity because it perverts the conjugal act, the intimate giving of spouses to each other.

According to this Canon, the conjugal act is that by which the marriage is consummated if the couple "have performed (it) between themselves in a human manner."

"If the technical means facilitates the conjugal act or helps it to reach its natural objectives, it can be morally acceptable," the statement said.

To the helpmeet feminists, however, it's axiomatic: literary creation is a conjugal act, the joint property of the betrothed.

What connection is required from the moral point of view between procreation and the conjugal act?

If, on the other hand, the procedure were to replace the conjugal act, it is morally illicit.

The female is pretty ruthless, too: she eats her mate before the conjugal act is even completed, using the poor guy's protein to help produce more eggs.