Why does he do these kind of things to himself?
Oh, who knows. Character identification perhaps?
Here you have the Cullen family of vamps. And here you have this Mormon author, Meyer, who describes the Cullens, particularly Edward, as “godlike” and “inhumanly beautiful.”
Romney, if he's a typical temple Mormon, already sees himself as a "god in embryo" -- a fave Mormon leader term for their sheep.
As for "inhumanly beautiful" -- consider Romney's BLOODline: One of the "original" Mormons in his family from whom Romney was descended was Lds "apostle" Parley Pratt.
Pratt was a womanizer who had a dozen simultaneous wives, including marrying already married (and attractive) Elenore McLean. She was married to a Customs House worker, Hector McLean, in San Francisco.
They were separated when Orson Pratt married her, raising the provocative jealousy of McLean and vigilantes who then knifed and shot Pratt dead in Arkansas.
Here's how Sally Denton in a book described Orson Pratt's physical features and 'missionary ways': "He had single-handedly converted hundreds of Saints, who idolized him. He had dark brows that framed deep-set luminous eyes, and his receding hairline was counterbalanced by tufts of curls at the base of his neck. An air of spirituality and confidence attracted his women proselytes, with sexual overtones marking his steady rise in the church. In the mystical and sensual temple endowment ceremonies, Pratt most often played the choice role of Adam, where, in the elaborate drama, women were thrust into his 'tempation' in the staged Garden of Eden. Only if they failed to succumb were they considered godly enough to receive their anointings. As early as 1846 a fellow apostle claimed that, while a missionary, Pratt would 'seduce girls and females and sleep & have connexion with them contrary to the law of God.' In his defense, Pratt attributed the allegations to his misunderstandings of celestial marriage. The following year, [Brigham] Young accused Pratt of committing adultery but stopped short of excommunicating him." (Source: American Massacre: The Tragedy at Mountain Meadows, September 1857, p. 110, Vintage Books, 2003)