Well, players should be able to change this stat at any time. You know, like for the classic "coming out of the closet" situation?
What if someone wants to roleplay that? Starting with a straight V, who believed all his life, that he likes the girls, and suddenly realizes, that he is gay? Or a straight female V, who realizes that she is lesbian in the middle of the game?
For this to work, the game must allow players to change the
sexual orientation stat at any time they wish...
...which ultimately makes it pointless to implement such stat in the first place