Once you get to the kitchen, which takes less than 5 minutes, you'll find plenty of copper cables and fuses, which is more than necessary to open all doors that have content up to the current version 0.11.
Now the doors visually show if they have the cables and fuses and you don't have to look at the door panel to unlock it, just turn on all the green lights by placing the fuses and the copper cable that will be open.
Some doors already have the fuses and the cable (bathroom and bedroom).
It's a fast and easy task, you don't have to do it again after you get the cables and fuses in the kitchen.
You can press the Z button to view all invisible buttons and use to view kitchen drawers.
Research Center(livrary) have no content yet, after you complete the first quest, just get the fuses and cable back.
In many games, some mechanics are put in place to make the game more interesting, like that game with zombies, when some door needs a very unusual thing to open.
which character is the futa?
There are no characters born Futa, any girl can use a vaccine that turns her into futa for some time, there is not much of this content, but soon there will be plenty.