Interrupted intercourse (lat. coitus interruptus) is a contraceptive method that is based on withdrawing the penis just before ejaculation.
According to the official teaching of the Catholic Church, sexual intercourse is permitted only for the sole purpose of procreation, and anything beyond that is lust and sin. The highest authoritative teaching of the Catholic Church, the Catechism of the Catholic Church, states the following: OFFENSES AGAINST CHARITY 2351 Lust (luxuria) is the disordered desire for sexual pleasure or the disordered enjoyment of it. Sexual pleasure is morally disordered if it is sought for its own sake, apart from its purposes of procreation and union, which are proper to conjugal love.
Furthermore, the Catholic Church argues against intermittent intercourse based on the Old Testament Biblical story of Onan, whom God punished/killed because he refused to father a child with a woman and used intermittent intercourse. Of course, this is a misinterpretation of the Biblical text by the Church. https://sk.wikipedia.org/wiki/Onan https://en.wikipedia.org/wiki/Onan The topic of masturbation is also related to Onan. Many prominent Catholic greats, church teachers, such as St. Augustine, considered masturbation a greater offense than premarital sex or prostitution (source English Wikipedia on masturbation and prostitution). You heard correctly: prostitution is a lesser offense than masturbation!!! And this awareness is more or less maintained in the Catholic Church to this day.
But let's get back to intermittent intercourse. In the Catholic Church, it is strictly forbidden for a man to ejaculate outside a woman's vagina!! In the Catholic Church, premarital sex is considered a lesser offense against God than intermittent intercourse!!! What is the result of this teaching? Many people praise the Catholic Church for being the organization that has the most charity projects in poor/poor developing countries. Isn't it a nice photo of a nun saving the life of a dying malnourished child in Africa? But what is the reality? First, the church charity organization threatens the local population with hell and God's wrath, saying that they will go to hell for contraception in the form of intermittent intercourse. Then the local population has an uncontrollable procreation of many children, which is a disaster. Then the Catholic Church boasts about saving the lives of malnourished children. Isn't that cynicism? Instead of the church teaching local residents contraception as part of its charitable work, instead of giving them condoms, the church is scaring them with hell, that if they have intermittent sex they will go to hell!!! The Catholic Church is a factory for suffering! The Catholic Church is a factory for undernourished children dying of hunger! The Catholic Church is evil, it is an instrument and source of suffering on this planet!
I'm still putting interesting links here. But be careful – these are not the pages of some small sect!!! This page presents the official teaching of the Catholic Church on sexuality!! You will be horrified!!!: Why not intermittent intercourse in marriage? http://www.lpp.sk/component/content/article?id=595%3Cimg%20src = No more intermittent intercourse, what next? http://www.lpp.sk/index.php?option=com_content&view=article&id=594:prerusovany-styk-uz-nie-co-dalej&catid=16015&Itemid=414 This is the official Catholic Church's guide to preparing a couple for marriage ceremonies. A Catholic priest will never marry a couple without first brainwashing them about how they will go to hell if they use intermittent intercourse http://www.lpp.sk/hikashop-menu-for-module-192/produkt/19-mravne-aspekty
Interrupted intercourse https://en.wikipedia.org/wiki/Coitus_interruptus
Religious activist Jana Tutková promotes the Catholic Church's teachings on contraception even at the cost of lies and forgeries. The Catholic Church prohibits contraception, oral sex and masturbation!!!! The Catholic Church has medieval teachings on sexuality, in many ways even stricter than Islam. 
