Sexual morality
In the church's teaching, sexual activity should be reserved to married couples without artificial birth control. Marriage is considered the only appropriate context for sexual activity, whether in a sacramental marriage among Christians or in a natural marriage where one or both spouses are unbaptized. Even in romantic relationships, including engagement to marriage, partners are called to abstain from sexual activity, in order to test mutual respect and fidelity.
Chastity in marriage requires, in particular, conjugal fidelity and protecting the fecundity of marriage. The couple must foster trust and honesty as well as spiritual and physical intimacy. Sexual activity must always be open to the transmission of new life; the church calls this the procreative significance. It must likewise always bring a couple together in love; the church calls this the unitive significance. Artificial contraception and certain other sexual practices are not permitted, although natural family planning methods are permitted to provide healthy spacing between births, or to postpone children for a just reason.
Church teachings about sexuality have become an issue of increasing controversy in the Western world, especially after the close of the Second Vatican Council in the 1960s, due to changing cultural attitudes described as the sexual revolution. Pope Francis said in 2015 that he was worried that the church has grown "obsessed" with issues such as abortion, same-sex marriage and contraception, and for prioritizing moral doctrines over helping the poor and marginalized.
The Catholic Church teaches that "homosexual acts" are "contrary to the natural law", "acts of grave depravity" and "under no circumstances can they be approved", but that persons experiencing homosexual tendencies must be accorded respect and dignity. According to the Catechism of the Catholic Church,
The number of men and women who have deep-seated homosexual tendencies is not negligible. This inclination, which is objectively disordered, constitutes for most of them a trial. They must be accepted with respect, compassion, and sensitivity. Every sign of unjust discrimination in their regard should be avoided...
Homosexual persons are called to chastity. By the virtues of self-mastery that teach them inner freedom, at times by the support of disinterested friendship, by prayer and sacramental grace, they can and should gradually and resolutely approach Christian perfection.
Orthodox Catholic groups, such as Building Catholic Futures, encourage parishes to incorporate celibate gay people into the church communities. Certain dissenting Catholic groups, such as DignityUSA, oppose the position of the Catholic Church and seek to change it and to educate Catholics on LGBT issues. The Catholic Church has banned all such groups from church property.
Canon law makes no provision for divorce between baptized individuals, as a valid, consummated sacramental marriage is considered to be a lifelong bond. However, a declaration of nullity may be granted when the proof is produced that essential conditions for contracting a valid marriage were absent from the beginning—in other words, that the marriage was not valid due to some impediment. A declaration of nullity, commonly called an annulment, is a judgement on the part of an ecclesiastical tribunal determining that a marriage was invalidly attempted.
Marriages among unbaptized individuals may be dissolved with papal permission under certain situations, such as a desire to marry a Catholic, under Pauline or Petrine privilege. An attempt at remarriage following divorce without a declaration of nullity places "the remarried spouse ... in a situation of public and permanent adultery". An innocent spouse who lives in continence following divorce, or couples who live in continence following a civil divorce for a grave cause, do not sin.
Worldwide, diocesan tribunals completed over 49000 cases for nullity of marriage in 2006. Over the past 30 years about 55 to 70% of annulments have occurred in the United States. The growth in annulments has been substantial; in the United States, 27,000 marriages were annulled in 2006, compared to 338 in 1968. However, approximately 200,000 married Catholics in the United States divorce each year; 10 million total as of 2006. Divorce is increasing in some predominantly Catholic countries in Europe.
The church teaches that sexual intercourse should only take place between a man and woman who are married to each other, and should be without the use of birth control or contraception. In his encyclical Humanae vitae (1968) Pope Paul VI firmly rejected all artificial contraception, thus contradicting dissenters in the church who saw the birth control pill as an ethically justifiable method of contraception, though he permitted the regulation of births by means of natural family planning (NFP.) This teaching was continued especially by John Paul II in his encyclical Evangelium Vitae, where he clarified the church's position on artificial contraception, abortion and euthanasia by condemning them as part of a "culture of death" and calling instead for a "culture of life".
Many Western Catholics have voiced significant disagreement with the church's teaching on contraception. Overturning the church's teaching on this point features high on progressive agendas. Catholics for Choice, a political lobbyist group that is not associated with the Catholic Church, stated in 1998 that 96% of American Catholic women had used contraceptives at some point in their lives and that 72% of Catholics believed that one could be a good Catholic without obeying the church's teaching on birth control. Use of natural family planning methods among United States Catholics purportedly is low, although the number cannot be known with certainty. As Catholic health providers are among the largest providers of services to patients with HIV/AIDS worldwide, there is significant controversy within and outside the church regarding the use of condoms as a means of limiting new infections, as condom use ordinarily constitutes prohibited contraceptive use.
Similarly, the Catholic Church opposes artificial insemination regardless of whether it is homologous (from the husband) or heterologous (from a donor) and in vitro fertilization (IVF), saying that the artificial process replaces the love and conjugal act between a husband and wife. In addition, it opposes IVF because it might cause disposal of embryos; Catholics believe an embryo is an individual with a soul who must be treated as such. For this reason, the church also opposes abortion.
The Catholic Church oppose all forms of abortion procedures whose direct purpose is to destroy a zygote, blastocyst, embryo or fetus, since it holds that "human life must be respected and protected absolutely from the moment of conception. From the first moment of his existence, a human being must be recognized as having the rights of a person – among which is the inviolable right of every innocent being to life". However, the church does recognize as morally legitimate certain acts which indirectly result in the death of the fetus. The 1983 Code of Canon Law imposes automatic (latae sententiae) excommunication on Latin Catholics who actually procure an abortion, if they fulfill the conditions for being subject to such a sanction.
Due to the anti-abortion stance, some Catholics oppose receiving vaccines derived from fetal cells obtained via abortion. On 21 December 2020, and regarding COVID-19 vaccination, the Congregation for the Doctrine of the Faith emitted a document stating that "it is morally acceptable to receive Covid-19 vaccines that have used cell lines from aborted fetuses in their research and production process" when no alternative vaccine is available, since "the moral duty to avoid such passive material cooperation is not obligatory if there is a grave danger, such as the otherwise uncontainable spread of a serious pathological agent." The document states that receiving the vaccine does not constitute endorsement of the practice of abortion, and that "the morality of vaccination depends not only on the duty to protect one's own health, but also on the duty to pursue the common good." The document says further: Those who, however, for reasons of conscience, refuse vaccines produced with cell lines from aborted fetuses, must do their utmost to avoid, by other prophylactic means and appropriate behavior, becoming vehicles for the transmission of the infectious agent. In particular, they must avoid any risk to the health of those who cannot be vaccinated for medical or other reasons, and who are the most vulnerable.