Family planning services are defined as "educational, comprehensive medical or social activities which enable individuals, including minors, to determine freely the number and spacing of their children and to select the means by which this may be achieved". Family planning may involve consideration of the number of children a woman wishes to have, including the choice to have no children, as well as the age at which she wishes to have them. These matters are influenced by external factors such as marital situation, career considerations, financial position, any disabilities that may affect their ability to have children and raise them, besides many other considerations. If sexually active, family planning may involve the use of contraception and other techniques to control the timing of reproduction. Other techniques commonly used include sexuality education, prevention and management of sexually transmitted infections, pre-conception counseling and management, and infertility management. Family planning as defined by the United Nations and the World Health Organization encompasses services leading up to conception and does not promote abortion as a family planning method, although levels of contraceptive use reduces the need for abortion.