An estimated 700,000 adults in the U.S. have received a controversial treatment known as reparative, or conversion therapy, under the belief that homosexuality is caused by nurture, not nature, and can be "cured." Erin Moriarty talks with young men and women who had undergone the treatment (voluntarily or at the behest of their families) in order to adhere to their church's teachings; with Alan Chambers, who was the charismatic director of Exodus International, which promised to convert those with "same-sex attraction"; Nashville pastor Stan Mitchell, who has rejected conversion therapy; and Jeff Johnston of Focus on the Family, which continues to promote the practice for parishioners who do not want to be gay. Subscribe to the "CBS Sunday Morning" Channel HERE: http://bit.ly/20gXwJT Get more of "CBS Sunday Morning" HERE: http://cbsn.ws/1PlMmAz Follow "CBS Sunday Morning" on Instagram HERE: http://bit.ly/23XunIh Like "CBS Sunday Morning" on Facebook HERE: http://on.fb.me/1UUe0pY Follow "CBS Sunday Morning" on Twitter HERE: http://bit.ly/1RquoQb Follow "CBS Sunday Morning" on Google+ HERE: http://bit.ly/1O3jk4x Get the latest news and best in original reporting from CBS News delivered to your inbox. Subscribe to newsletters HERE: http://cbsn.ws/1RqHw7T Get your news on the go! Download CBS News mobile apps HERE: http://cbsn.ws/1Xb1WC8 Get new episodes of shows you love across devices the next day, stream local news live, and watch full seasons of CBS fan favorites anytime, anywhere with CBS All Access. Try it free! http://bit.ly/1OQA29B --- "CBS Sunday Morning" features stories on the arts, music, nature, entertainment, sports, history, science, Americana and highlights unique human accomplishments and achievements. Check local listings for CBS Sunday Morning broadcast times.