The twins data is d_mning - literally.
There is a genetic predisposition, though, because identical twins are more likely to be of the same sexual orientation than fraternal ones. The genetic component is not the main factor, though, and even less so for women than men.
I’m fairly familiar with that data but can you post a link. I need concrete facts and a study name as I am in a continued and heated debate with a doctor over this issue.
A doctor - an actual medical doctor who thinks homosexuals are ‘ born this way ‘. A person who must work with facts and proof on a daily basis.