Is this game has incest, because i was curious
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There is and it's optional, just like almost all of the naughty stuff.
You can simply toggle it on or off at the start of the game.
Alternatively, and this is mostly for returning players to enable or disable that mode with the following code that can be used on the computer (day 12+): "Whosyourdaddy-on" or "Whosyourdaddy-off"