We can define fertility as the inability to become pregnant after one year of regular sexual intercourse.
The causes of infertility are evenly distributed among men and women, 30-40% each.
In 15-30% of the cases, infertility actually results from both partners.
In 5-10%, the biological origin can not be diagnosed.
Female infertility can be attributed to hormones, obstructed fallopian tubes, or immunological factors.
Male infertility can be attributed to inadequate sperm production or dysfunctional sperm transport.
Male and female infertility can also be attributed to psychological factors.
