yes. sexuality is determined entirely at birth.
no. sexuality is decided by life-events and factors out of our control.
sort of. attraction to men, women or both is decided at birth and other kinks are decided later.
no. sexuality is purely a conscious choice.
At birth you are supposed to be attracted to the opposite sex to procreate so you can have a child of your own. I don't think anyone came out of the womb wearing a earring in their right ear and admiring the male doctors protruding bulge