Contraception Is a Mortal Sin
Is contraception a mortal sin?
The Catechism of the Catholic Church defines a mortal sin (a sin that destroys charity in the soul) as “a sin whose object is grave matter and which is also committed with full knowledge and deliberate consent.”
Contraception is a sin that gravely violates God’s design for human sexuality. The Catechism states:
Every action which, whether in anticipation of the conjugal act, or in its accomplishment, or in the development of its natural consequences, proposes, whether as an end or as a means, to render procreation impossible is intrinsically evil (2370).
So, if an individual engages in contraceptive sex, fully knowing that it is gravely sinful, and chooses it without any mitigating factors to lessen one’s culpability, charity will cease to exist within that individual’s soul. In other words, the act will have a mortal effect within the soul.