Well, I didn't believe in matrimony that much either (until I met my husband ) but it is a good way to get the visa. I mean if the Institution of the Matrimony doesn't have any meaning for you but it can help you to get something that you want so bad, why don't do it? I can understand your ladyfriend because maybe for her the act of getting married in order to get a benefit is like if she agreed with the Institution. Well, I have to say that I don't like to sign any paper either but sometimes you have to in order to get nice things. But if she really believe she is doing the right thing, good for her!!!