All single missionaries live and work with a companion of the same sex.
Courtesy Floyd Holdman. From the earliest days of the Church, missionaries have been called to the nations of the earth to preach that message. A full-time mission is an ecclesiastical unit of the Church in a designated geographical area. A mission president and his wife are called to preside over the mission and supervise from 120 to 250 full-time missionaries. Small missions in newly opened areas begin with fewer missionaries.