I completely believe that it is environmentally enforced. I knew three men in my life all three of them were abused as children by men. Two of them, came out of the closet, and re-enforced their lifestyle by immersing themselves in it, seeking conditions that would reward them for the behavior, the third sought a more christian lifestyle, re-enforcing his tendencies to be heterosexual. Only one of them claimed they were “born” gay, but he was raped at age of three, so how would he know that. Like I say, it’s completely based on environment and continued re-enforcement of behavior.
Joseph Nicolosi, a prominent psychologist, has studied the causes of homosexuality in depth for many years and believes it is caused primarily by the failure of the child to bond to its same-sex parent and thus, fully developed its psychological identity as a male. There are a number of other psychologists and psychiatrists who support this view and who also believe some homosexuals can overtime this gender identity problem, especially the sooner they enter therapy.