It has been claimed by many for a long time that sexual orientation is naturally heterosexual for humans and any deviation is unnatural and must be a choice. Well, that logic was developed long ago before modern medical and psychological and natural science were developed and understood. We know now far more about human nature and genetic makeup and brain chemistry and structure than ever in human history. We know now what assumptions are true and what are fallacy. Humans are far more diverse than previously believed. Each person is an individual. Each of us are basically genetically human, but with individual variances in genetics and psychology and physicality. Often what we think of as “choice” is actually nothing more than “realization” and natural determination. Humans tend to fall into 3 basic natural sexual orientations: Heterosexual, Homosexual and Bisexual. With much individual variance between each. It is now known that few of us are actually “pure” in our sexual orientations. Some embrace it as a gift from GOD or nature, while many others deny it as “unnatural” or deviation from “normal.” The reality is actually that “normal” is “variation and individuality.”
In summation: Claiming you can choose sexual orientation makes as much sense as saying you can choose your ethnicity. Nature may preserve a set basic “norm,” but it also preserves “diversity of biology” for the greatest chance of survival. Procreation is but one means and any of the 3 human basic sexual orientations can “procreate, but sexuality is far more than for just procreation. It is also greatly about companionship and security and good health.