I think any study has validity, but when religion is involved, my suspicions begin: Dr. Sarah M. Coyne, School of Family Life, Brigham Young University, Provo,

I think any study has validity, but when religion is involved, my suspicions begin: Dr. Sarah M. Coyne, School of Family Life, Brigham Young University, Provo, Utah, USA. Specifically: https://familylife.byu.edu/ https://familylife.byu.edu/ "Provide instruction that fosters commitment to the principles in The Family: A Proclamation to the World." ...and that proclamation is.... "THE FAMILY A PROCLAMATION TO THE WORLD The First Presidency and Council of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints We, the First Presidency and the Council of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, solemnly proclaim that marriage between a man and a woman is ordained of God and that the family is central to the Creator’s plan for the eternal destiny of His children. All human beings—male and female—are created in the image of God. Each is a beloved spirit son or daughter of heavenly parents, and, as such, each has a divine nature and destiny. Gender is an essential characteristic of individual premortal, mortal, and eternal identity and purpose."