Why does the Church teach that contraception is wrong?

Contraception is not considered wrong by the Church because of its artificial nature. After all, there is nothing morally illicit about paracetamol or vitamins. The purpose of medicine is to help the body work in the correct way. Contraception does not help the body to function properly: It does exactly the opposite. Some methods of contraception, such as the oral contraceptive pill, are also an abortifacient. This means that they can cause early induced abortion at the beginning of a pregnancy. The God given purpose of sex is babies and bonding. Contraception divides these purposes in two.