Abstinence

The choice to abstain from sexual activity altogether or until marriage is called abstinence. If two people don't have sex, then sperm can't fertilize an egg and there's no possibility of a pregnancy. With abstinence, no barriers or pills are necessary because the person is not having sex. Many people believe this is a life choice, not a birth control method, but it is categorized as one. You do not need to be a virgin to practice abstinence. This is something you can choose to do any time, as long as you are happy and comfortable with your choice. There are many different reasons people choose to abstain. Some of these reasons may be to prevent pregnancy and STD's, waiting till they find the "right" partner, waiting until they are ready for a sexual relationship, focusing on school or career path, religious beliefs, medical reasons or to help heal after a bad breakup.
Abstinence is 100% effective in preventing pregnancy and STD's. It is the only flaw proof method. "Although many birth control methods can have high rates of success if used properly, they can fail occasionally. Practicing abstinence ensures that a girl won't become pregnant because there's no opportunity for sperm to fertilize an egg."
(http://kidshealth.org/teen/sexual_health/contraception/abstinence.html)
Like everything else, there are advantages and disadvantages to being abstinent.
They are:

• no medical or hormonal side effects
• free

The disadvantages include:

• People may find it difficult to abstain for long periods of time
• Women and men often end their abstinence without being prepared to protect themselves against pregnancy or infection

Abstinence is not for everyone, and for many people it can be a difficult choice. If you are tempted to stray from your abstinence pledge, it helps to stop and think why you chose that path in the first place. In the end, you need to do what is going to make you happy.