The term infertility is generally used when a couple fail to conceive after they have tried to have a baby for about a year. Under normal circumstances, 80% of women who have regular sex without using contraception will get pregnant in the first year of trying. However, age, lifestyle and biological factors can lower the chances of conceiving. Since fertility normally declines with age, fertility evaluation is recommended for couples over thirty five years who have not conceived after six months of regular unprotected sex. Couples under thirty five should be given medical counseling if they have not conceived after one year of trying. Sometimes, simple advice such as having regular intercourse will enable them to overcome the problem.