I read a review of a new movie last week that reminded me of Twin Souls. Called The Ballad of Genesis and Lady Jaye, it is about two people who fall in love and want to be together (you can read about it and see the trailer here). Yet, their love is so consuming that they feel they "want to eat each other up." Being performance artists, they decide to take their desire for union to another level: they undergo a series of plastic surgeries in order to look more and more alike.
While I haven't seen the movie, it does pique my interest simply because I think that the soul in a Twin Soul relationship does desire to become one with its other half. As to whether I personally would undergo plastic surgery to look like my Twin, well, that's another matter completely. Probably not.