Aspiring parents resort to using a surrogate pregnancy to have a child when no intended parent can gestate the child. This can happen for many different reasons. An aspiring mother may be unable to gestate because she no longer has a functioning uterus or because of her own health risks during a pregnancy. Same-sex male couples use surrogacy to supply the uterus they do not possess.
Starting a family is harder for those suffering from uterine infertility and same-sex couples who must use a surrogate to have a child. As with other issues related to the parentage of children, the laws in each state and each country differ, and it's very complex to plan a reliable family-building process amid the discrepancies.