I have experience with it for starters, and yes I have done my homework. Both scientifically and theologically (my first post was about theology). And I am convinced that environmental factors have a far greater role in determining the sexuality of an individual than genetics do. No, I'm not a doctor (very few people at the age of 22 are), nor is it my calling to be a doctor in the medical realm. But I have relatives that work in universities as professors in the area of psychology and sociology. So I have access to academically peer reviewed medical papers.
I may not be politically correct in my stance, but there is good evidence that backs up my position.
As I said before in my first post in this thread, there are some genetic factors involved here (in the development of the brain), which can determine the sexuality of an individual. However, many of those genetic factors are switches that need to be triggered, usually by environmental factors (stress, alienation, abuse, trauma, social pressure) are the most common. For those that use animals as a defence, need to realize that these environmental factors also occur in nature.
And I still stand by the notion of whether someone (a conscious person) engages in sexual lifestyle or not is a choice. The need to reproduce from a human perspective is instinctual. However when, where and how, yet alone whether they choose to or not, is a conscious decision (which is what differs us from the animal population in regards to sex).
Considering the complexity of sexuality, I've found a few articles that are easier to understand for the layman. One thing is for certain, the blanket statements 'I was born this way' or 'Its a choice' are far too simplistic, the truth is that sexuality is a combination of the two. Although I place my money on environmental factors being the greater contributor (as this article points out).
Genetics and Environment Shape Sexual Orientation | Psych Central News
Non-shared environment - is a subtype of environmental influences that refers to the environmental factors that produce behavioral differences among siblings living in the same household. Can also refer to the environmental influences that are unique to a given individual.