Does a female-to-male sex change work?

It can be done. Female-to-male gender reassignment is harder than male-to-female because of the external genitalia and the need for erection during sex. What's harder than creating the penis from flaps and erasing any signs of female breasts, however, is making sure that the person really is ready for the change. This requires a long period of living as a male while undergoing counselling and hormone treatments.

Related Questions

How does a female-male sex change work? How do they get all functions to work? Would the girl start producing sperm or what? It makes no sense to me

No sperm. No sperm would be produced. And the extent of the changes a person choose to undergo varies. See http://en.wikipedia.org/wiki/Sex_reassignment_surgery_%28female-to-male%29. Read more...
Ok, first things 1st. No, genetically female people who identify themselves as male mentally do not have a Y chromosome. Therefore they lack the genetic and biological machinery to make sperm. So that answers that. And there is no way to make a genetic male into a genetic female or vice versa. However the treatment is oriented toward creating the gender identity outwardly that the person feels internally. Read more...