I know of a formerly Evangelical church member who ended up there. I think it was a combination of a desire for social climbing plus some guilt over past sexual behavior. The Episcopal church, to my knowledge, does not have any moral guidelines for sexual behavior. Anything goes.
The Episcopal Church does not believe in the authority of Scripture. It also does not believe in the concept of sin. It teaches that those who are water baptized in its church are assured of going to Heaven, and there is no requirement for an amendment of life or any other requirement.