Infertility is definite as 1 year of exposed intercourse without conception. It affects about 14% of couples and is a medical worry for 2.7 million women of reproductive age in the United States. Infertility reasons great distress to many couples, causing growing numbers of them to seek expert fertility care. There are many causes of infertility including male and female factors. Journal Article is sometimes called a Scientific Article, a Peer-Reviewed Article, or a Scholarly Research Article. Together, journal articles in a particular field are often referred to as The Literature. Journal articles are most often Primary Research Articles. However, they can also be Review Articles. These types of articles have different aims and requirements. Sometimes, an article describes a new tool or method. Because articles in scientific journals are specific, meticulously cited and peer-reviewed, journal databases are the best place to look for information on previous research on your species.