I am reading Al Mohler’s book We Cannot Be Silent. The second chapter details how birth control, no fault divorce, and fornication by heterosexuals led to an open door for the sodomite agenda and same-sex marriage. Here is the last paragraph from that chapter. Emphasis mine.
It is profoundly true that the sexual revolution did not begin with same sex marriage. The sexual revolution began when a significant number of people in modern society decided to liberate themselves from the inherited sexual morality that had been derived from Christianity and had informed the cultural consensus throughout human history. That was a decision largely made by heterosexuals who intended to legitimize their own sexual sin by means of a new moral argument. There were sexual revolutionaries advocating and hoping for the normalization of homosexuality from the beginning, but these were voices far outside the mainstream. Today’s movement toward the total acceptance of homosexual behavior and relationships was only made possible because some heterosexuals first did their best to undermine marriage.
The only thing I would add to Dr. Mohler’s analysis is that heterosexuals who started the sexual revolution were often part of the church.