It is often argued that women have a right to control their own reproductive capacity and that abortion is a vital tool for doing this. Proponents of this view state that nobody has the right to force a woman to undergo a nine month pregnancy, with all the accompanying discomfort and serious health risks, if she does not want to. Some say that the right to abortion is absolute and it is acceptable to use it as a method of birth control; other pro-choice advocates disagree but believe it should be available in cases where pregnancy will endanger the woman's health, the fetus has a severe congenital defect or the pregnancy resulted from rape or incest.
Another advantage is the modification of genetic traits in human beings. Human genetic engineering science modifies human beings genotypes before birth. This process can be utilized to manipulate some traits in people. Genetic engineering can be employed to suppress negative traits while boosting positive ones. Positive genetic engineering is concerned with the enhancement of positive individual traits. This includes increasing human capacity or longevity. Conversely, negative genetic engineering is concerned with the quelling of negative human traits such as some genetic diseases.