In XoR, I set things at the pace of the story – your assigned gender isn’t chosen til toward the end of a (generally longish) prologue, your attractions early in Chapter 1, your name a bit after that, and what you’re good at toward the middle of the chapter.
Might you be bi? We won’t know until halfway through the game when the ROs from the opposite gender to the one you originally picked show up.
As a reader, I much prefer this style to the “char-gen” section all packed into the first few pages of the game, which is why I’ve also written my game that way.