What are you getting at? Identical twins by definition have the same genes. If they're normal identical twins then that would pretty much imply that it's not genetic
No.
http://www.geneticsawareness.org/learn-about-genetics/have-questions-about-genetics/are-identical-twins-100-genetically-identicalThis is what I mean, sure, their DNA is the same, but they aren't exact copies to each other:
"We know also, that there are some changes to our genes that can happen during the embryonic period or during development. While this rarely happens, it makes it so that one identical twin may have a genetic condition, while the other twin does not. Our genetic code is a very large part of our genetic makeup, but there are other factors, genetic and environmental, that make us unique!"
Yes it is.
Genetics are bullstuff, human brain has get loveually attracted to what they want at younger ages, people choose their loveual attraction, but yes once you've formed a loveual attraction toward a love, it's hard to change it, humans choose.
It's a choice.
Possibly, but there is actually stories of kids who were isolated from the knowledge of homoloveuality, and they turned out to be homoloveual.