Sex should only be used in a marriage relationship. Sex before marriage is wrong. All of the Christian churches believe that marriage should be monogamous, meaning that only one partner should be involved within the marriage. This can be seen in the New Testament of the Bible. “Let each man have his own wife and let each woman have her own husband” (1 Corinthians: 2-3)
About life?
Catholics believe that life is a gift from God. Life is sacred because God is involved in the creation of life, and therefore taking a life is wrong which is why Catholics are againsed murder and abortion.
“Life must be protected with the utmost care, from the moment of contraception; abortion and infanticide are abominable crimes” (gaudium et spes)
Christianity disapproves of abortion. "For you created my inmost being; you knit me together in my mother's womb"(psalm 139).
One of the Ten Commandments is ‘thou shall not murder’ this means you should not take a life. This is why abortion is said to be wrong.
About Abortion and Contraception?
All Christians believe in the sanctity of life. This means they believe life is holy, sacred and pure and should be protected.
“the direct interruption of the generative process already begun and, above all, directly willed and procured abortion, even if for therapeutic reasons, are to be absolutely excluded as licit means of regulating birth” (Humane Vitae)
A denomination of the Christian belief that does allow abortion is the Church of England. The Church of England does not allow abortion in all circumstances. This means they may agree, in some circumstances I believe that there are times when it would be better for a child not to be born. The reasons allowing abortions are: A risk to the mother bearing the child, if the child is going to be severely handicapped and does not stand a chance of living a happy life or if the mother of the child has been raped as this may cause long term emotional damage if she now has the child.
“You shall not kill the embryo and shall not cause the newborn to perish” (The Didache)
The Church of England says that abortion may never be used for the convenience of the mother; there must always be a good or one of the mentioned reasons.
In the Church of England abortion is still a bad thing and is said to be "killing a child" and "Abortion is evil but may be acceptable in some circumstances”. (The teachings of the Church of England)