A new mega study focused on genetics and same sex relationships says sexuality is not simple. It’s complex and a multitude of environment, social factors and genes play a role in defining it.
In assigning percentages, the study says genetics perhaps plays only 1/3rd of a role. And it’s not a single gene, but many that may lead one to have ‘same sex’ sex.
Simply put, genetics don’t alone define if someone will have a same sex relationship.