Like
SuddenReal said, as the content is part of the game the relevant tag needs to be applied.
This may be a good time to realize that the current tagging system in no way, shape or form does indicate how heavily the content is featured or if it's avoidable or not. In other words: searching content by tags without reading the information in the OP and avoiding possibly doing a search on the thread to see if it is indeed worth ones while will quickly lead to disappointment. There are for instance games being tagged for a single render among thousands (MidLife Crisis:
gay
) or a bonus render unrelated to the actual content (Reincarnotica:
incest
). Or in this case people playing
futa/trans
games inside the actual game.