So you are saying it is influenced by genetics. That is far different from a blanket people are "born" gay statement.
And my thought experiment is perfectly valid. I am saying people don't choose to be criminals either.
Here is the funny thing (I am a geneticist, by the way), Everything is 100% genetics, and yet very few things are 100% genetics.
....it truly comes down to that.
The studies that are "searching for a 'gay gene'" and what they find, never completely proves or excludes the genetic component. That is a fact.
You have a particular BRCA1 mutation! Does that mean you
will get Breast cancer? no, no it does not.
It's as equally likely that there is a "gay gene" that there is not one, and also that it is a more complicated and nuanced system of transcription factors doing their thing in a very specific moment--hence, the time of expression for this to happen occurs in a very short window during development, which makes it difficult to detect later in life.
Here is the answer: Is it genetic? of course it is. Is it environment? Yes, probably also true.