Sex is supposed to be the renewal of the wedding vows. It’s extremely important for Catholics. It’s extremely important for the relationship.
As beautiful and as wonderful as sex is, it’s not strictly necessary for spouses to continue having sex with one another. In some circumstances, it would actually be inadvisable (e.g. when it might endanger a spouse’s health) or even prohibited (e.g. if one’s spouse was in a coma). Having practiced the virtue of self-mastery (a.k.a self-control, continence), which promotes authentic freedom, helps make this easier.
The Church supposedly thinks that the procreative and unitive dimensions of sex are supposed to be equal. But then why do they insist every act must be procreative (even if the woman is already pregnant or past menopause) but they don’t insist that every act must be unitive?
This is an inaccurate representation of the Church’s teaching.
The Church does not teach that each sexual act “must be procreative,” not least because this is beyond the control of spouses. Rather, the Church teaches that “each and every marriage act must remain
open to the transmission of life,” however remote; that the sexual act’s capacity for procreation not be
deliberately frustrated before, during, or after sex.
Similarly, the Church does not fail to insist that each sexual act must be unitive. The Church teaches that “sexual pleasure is morally disordered when sought for itself, isolated from its procreative
and unitive purposes.” Neither the procreative capacity nor the unitive meaning may be licitly separated from sexual acts: “man on his own initiative may not break {the inseparable bond} between the unitive significance and the procreative significance which are both inherent to the marriage act… Men rightly observe that
a conjugal act imposed on one’s partner without regard to his or her condition or personal and reasonable wishes in the matter,
is no true act of love, and therefore offends the moral order in its particular application to the intimate relationship of husband and wife.”
“If each of these essential qualities, the unitive
and the procreative, is preserved, the use of marriage fully retains its sense of true mutual love and its ordination to the supreme responsibility of parenthood…”