The ability to control one's sexual urges is part of human nature and also an important distinction between humans and animals. The practice of abstinence enables couples to exercise fidelity within a relationship. Many find that sexual activity is best when accompanied by the deep commitment of marriage and openness to the possibility of children. Not everyone is ready for this kind of commitment and total self-giving. For this reason, many women and men choose to abstain.
Many people have their own definitions of sexual abstinence.
One good rule of thumb for those who are unsure, is to ask yourself if the behavior in question can only be done in private. Abstinence is superb contraception, not to mention everyone's first method. Yet many unmarried couples find it easier said than done. For young people especially, it might be easier if high pressure situations, like automobile back seats or empty dorm rooms, are avoided. Abstinence is the only way to assure that pregnancy will not occur.