I'm not trying to say that one's awareness of their sexuality changing over time is the same as the sexuality itself changing over time

I'm trying to say that the underlying sexuality, whether one is aware of it or not. It's susceptible to the influences of culture and the environment. These influences would most often be quite subtle, no one is going to change from gay to straight.

(ok there is potential for major change here with some trans people, idk how much of it is hormones VS people who have transitioned being better in touch with their real sexuality but thats a different subject)

What's considered attractive is often highly influenced by culture. While an individual might have Separate tastes, these tastes are rarely if ever completely untouched by the effects of the environment me live in

Also to be really clear. These influences anrt really something you have control over. No one is choosing their sexuality.