Mormons have developed a strong sense of community that stems from their doctrine and history. One of the central doctrinal issues that defined Mormonism in the 19th century was the practice of plural marriage, a form of religious polygamy. From 1852 until 1904, when the LDS Church banned the practice, many Mormons who had followed Brigham Young to the Utah Territory openly practiced polygamy. Mormons dedicate significant time and resources to serving in their churches. A prominent practice among young and retired members of the LDS Church is to serve a full-time proselytizing mission. Mormons have a health code which eschews alcoholic beverages, tobacco, tea, coffee, and addictive substances. They tend to be very family-oriented and have strong connections across generations and with extended family, reflective of their belief that families can be sealed together beyond death. They also have a strict law of chastity, requiring abstention from sexual relations outside heterosexual marriage and fidelity within marriage, though the Community of Christ is accepting of LGBT individuals and relationships.