Your sexuality is interchangeable; it is not a solid nor pre-determined state
however
score: 6
we should first ask, what we mean with "sexuality". It`s just gender (penis vs. vagina) or it`s more like a drive, that it`s like appetit (that can have a lot of different objects), or it is something else.
Different people have their sex drive changed by external factors at different degrees. One may be more susceptible to said factors more than one more rigid in their erotic plasticity.
This falls under a single cause fallacy. Biology is certainly a determinant, but cannot be said to be the only factor in sexuality. Research on the topic is still all over the place today.
debprac
sexuality can be defined to include thoughts and actions, which can change in intensity and direction as a person ages, when they learn more about themselves and gain more experience.