This is so ludicrous. You don’t need academic studies to tell you that relationships characterized by unnatural sex acts are inherently disordered and unwholesome. Children deserve to be raised in normal, wholesome environments with normal wholesome people.
I don’t think it is so much the sex acts of homosexual parents that cause the problem with children raised by homosexuals as the fact that these parents are, by definition, unconventional. I am no scientist, but simple observation of children whose parents are “different” in an observable way would likely disclose that they will not fit into society as well as children of “normal” (conventional) parents. Back when divorce and unmarried parenthood were less common those children whose parents were divorced or who had no daddy had different life experiences than two-parent mother/father children. Little things like father/son activities (which no longer seem to take place in schools...) and the like have to create a feeling that the child is somehow “abnormal.” This has to have an effect. Now, add to that the position that many of us take that homosexual behavior is wrong, and it would be amazing if these children did NOT have problems.