Only 12s (and I guess fetishists and people who never plan on getting laid, ever.) go completely feral. Most people trim at the very least. Not porn star landing strips but maybe something a little more groomed. 12-bush on sims always makes them look like they don't wash. Maybe this should accompany a "Has VDs" trait.
You don't know what you're talking about. I stopped shaving my legs and armpits at about 30, and have never ever shaped my pubic hair. I have been married 4 times, each time to a man who had already inspected my hair distribution and knew what he would be getting. I have never had venereal disease either.