Hetero and homosexuality are caused by hormonal balances/imbalances and chemicals in the brain and all that stuff. Is bisexuality also not a choice, or is it that a homo/hetero sexual subconsciously tend to favor a gender, but will also be pleased with the other gender, causing it to be a choice, or do they find both equally good and it's some other chemical hormonal balance thing in the brain also?

Any anti-LGBT person here should not reply to this because I'm not looking for your opinion.