Could you pass yourself off as the opposite sex?
I think it largely depends upon your face and build - certain face shapes are asexual and smaller builds too lending themselves well to conversion
I like all the comments by the cynics with no real life experience on this board stating they were not fooled and could never be fooled...really? Just visit a red light area and you'd be amazed that some of the women are men. I have even dated a few women who were genuine women but friends have thought they were transexual - LOL maybe that means I like masculine women...dont know