Ability of an individual or couple to reproduce through normal sexual activity.
About 80% of healthy, fertile women are able to conceive within one year if they have intercourse regularly without contraception . Normal fertility requires the production of enough healthy sperm by the male and viable testes to the female fallopian tubes, penetration of a healthy egg, and implantation of the fertilized egg in the lining of the uterus (see reproductive system ). A problem with any of these steps can cause {{link=infertility">infertility .