A lot of people think they need to give up nature to become adults but that's not true. However, you have to be careful how you describe and define 'nature.
Biblical backing for Mormon behavior is easy to find, although Mark Twain is reported to have denied its legitimacy to a Mormon. The Mormon claimed polygamy was perfectly moral and he defied Twain to cite any passage of Scripture which forbade it. 'Well,' said Twain, 'how about that passage that tells us no man can serve two masters at the same time?'