necessary? no - optional? yes. I believe the requirements are flirting with Shade and then taking her up on the offer in the hot springs. i am unsure how else i could have properly gated that content, beyond some sort of content flagging system which I have not yet built. hope you enjoyed the game beyond that!
the game so far has only 1 female character you can do sexual stuff with, and also only one that isnt a background character, and it's optional to do stuff with her; so I think it more than earns the gay and bara tags
if anything, I think a game should be able to have the gay, straight, and bi tags simultaneously if it's all optional