Here's a highly informative page I came across about androgen insensitivity syndrome (and how it destroys the argument that your sex depends on whether you have a Y chromosome or not).
http://www.secondtype.info/ais.htmThe youtube videos are good in that you can see from them that people with these conditions really are female, despite being genetically male, to the point where you wouldn't know there's anything unusual about them without being told.
Here's another one, of a lady with Swyer's Syndrome, which is another condition that causes genetically male people to develop as female: