No, it's not. Because in a choice-based, character driven story, and considering the "no sexual content" tag, this very much is a character driven story, you want the player to be able to insert themselves into the character. With a kinetic novel, the player has no freedom to decide what the MC is like, so they base their decision to play on the tags. That way, if they're not into dudes fucking each other, women fucking each other, etc. they can avoid the game. But when the game is choice-based, forcing the MC to be bi is a failure of the narrative.