Kiseff disabled that by default, so it should still go full sized! Some of the models used to get a bit bigger, but they kept complicating animations and clothing models with lots of clipping and tearing. There was also a point where using a save editor could allow models to overscale parts.
If the second person wants to play a game that doesn't let you make giant butts, they can just play like 90% of all other games with character creators in them
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Take a shot whenever someone posts, "duality of a person".
Or give peeps options I guess, idk...
You choose where you put the slider for your own character.
For the first person: go in the menu and uncheck the option that limits the sliders for even larger body parts.