But then they will never find that because the environment always plays its part in understanding behaviour. We can trace colour blindness through genetics but behaviour? Far less likely to be solely attributable to genetics. Twin examples prove that.
An individual can behave as a homosexual and then become heterosexual for example. There are some posters who believe that is the definition of bisexual but it is not. It can be an individual can become heterosexual for the remainder of his life - yes, I know of such cases.
