Surrogacy is an arrangement, often supported by a legal agreement, whereby a woman agrees to delivery/labour on behalf of another couple or person, who will become the child's parent(s) after birth. People may seek a surrogacy arrangement when a couple do not wish to carry a pregnancy themselves, when pregnancy is medically impossible, when pregnancy risks are dangerous for the intended mother, or when a single man or a male couple wish to have a child. In surrogacy arrangements, monetary compensation may or may not be involved. Receiving money for the arrangement is known as commercial surrogacy. The legality and cost of surrogacy varies widely between jurisdictions, sometimes resulting in problematic international or interstate surrogacy arrangements. Couples seeking a surrogacy arrangement in a country where it is banned sometimes travel to a jurisdiction that permits it. In some countries, surrogacy is legal only if money is not exchanged. Where commercial surrogacy is legal, couples may use the help of third-party agencies to assist in the process of surrogacy by finding a surrogate and arranging a surrogacy contract with her. These agencies often screen surrogates' psychological and other medical tests to ensure the best chance of healthy gestation and delivery. They also usually facilitate all legal matters concerning the intended parents and the surrogate. Methods Surrogacy may be either traditional or gestational, which are differentiated by the genetic origin of the egg. Gestational surrogacy tends to be more common than traditional surrogacy and is considered less legally complex. Traditional surrogacy A traditional surrogacy (also known as partial, natural, or straight surrogacy) is one where the surrogate's egg is fertilised by the intended father's or a donor's sperm. Insemination of the surrogate can be either through sex (natural insemination) or artificial insemination. Using the sperm of a donor results in a child who is not genetically related to the intended parent(s). If the intended father's sperm is used in the insemination, the resulting child is genetically related to both the intended father and the surrogate. In some cases, insemination may be performed privately by the parties without the intervention of a doctor or physician. In some jurisdictions, the intended parents using donor sperm need to go through an adoption process to have legal parental rights of the resulting child. Many fertility centres that provide for surrogacy assist the parties through the legal process. Gestational surrogacy Gestational surrogacy (also known as host or