Ray and colleagues define "unexplained infertility" as failure to achieve pregnancy when the semen analysis is normal, evidence for ovulation is present, and tubal patency has been established. The efficacy of treatment declines with increasing age and duration of infertility Infertility is a disease , defined by the failure to achieve a successful pregnancy after 12 months or more of appropriate, timed unprotected intercourse or therapeutic donor insemination, barber evaluation and treatment may be justified based on medical history and physical findings and is warranted after 6 months for women over age 35 years.