June 16, 2021 at 7:45 pm #110421
As far as I know, nothing has been conclusively proven. There are some indications maybe, but not solid proof.
I remember seeing some studies of gay siblings and even twins, in terms of life experience and not physiology. What I remember is that there didn’t seem to be a clear pattern. There were gay and straight siblings and sometimes all siblings were gay or all straight and the same variations for twins. To me the interesting thing is how twins turned out as they were raised in the same situation and in the same time frame. Anyway, last I saw it just wasn’t conclusive…