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Fertility is the ability of a couple to conceive, but can related to specifically the man or woman.
Various reasons can cause a couple to be infertile, and due to the strong desire of these patients to have <!--LGfEGNT2Lhm-->children, a range of assisted reproductive therapies have been developed to aid couples who have reduced fertility.
For people who are fertile, contraceptive treatments are available to reduce their fertility, in order to avoid unwanted pregnancies.
Because of the importance of both contraception and assisted reproductive therapies, and possible clues to other conditions such as <!--LGfEGNT2Lhm-->cancer, <!--LGfEGNT2Lhm-->endometriosis and 'period pains' that fertility may hold, it is heavily researched.