I believe and I have seen—that some—a percent of Gays—can change. Its a small percent—but some can and have. Others, maybe a majority, can not and will not. I would like to see more do so because—and this is my belief—and maybe I am wrong—that they would make great fathers and mothers—we are losing good people who go childless for the most part. If some—even a few change—that would be a good thing. Some can’t—I am Ok with that.
I have the book. It's Homosexuality by Irving Bieber (former U of H psych professor), who researched homosexuality, its etiology and treatability over several years in the 50's and early 60's. His work is now verboten and virtually banned by the infamous Division 44 of the American Psychological Ass'n., which has arrogated to itself all authority over the subject (in order to suppress dissent from PC).
Bieber's opinion was that about a third of homosexual men are treatable with psychotherapy but many are not. I don't have his breakdown available at the moment.
But his basic finding was "some are, and some are not, 'essentially' homosexual."