Although a faithful marriage to an uninfected person precludes the possibility of a sexually transmitted disease, pregnancy may be a possibility for up to thirty years. Birth control can and does fail . Unless at least one person is infertile, a surprise pregnancy can happen at any time. The most common response to this biological fact is the use of contraceptives. Contraceptives can provide reasonably good protection from an unexpected pregnancy, but they are not foolproof.
Stress can occur when an unplanned pregnancy arises at a difficult time.
Since married couples generally do not consider adoption a viable option, they will either choose parenting or resort to an abortion. Abortion within a marriage is an unfortunate event which can negatively affect the whole family. A few couples choose not to contracept , trusting God for however many children come along. Very large families can result, but some of these couples have surprisingly few children. Benefits of this type of sexual relationships is that the couples don't have the worry of an unplanned pregnancy.