What Value are Twin Studies?

http://joanneproctor-hbs.blogspot.com/2008/12/what-value-are-twin-studies.html
12/7/2008

Its usually interesting to identify the starting biases of commentators when they have something to say on transsexualism. The statements below demonstrate quite clearly that, at least so far as the author is concerned, all transsexuals start out as either cross-dressers or ->-bleeped-<-s. In this he is simply expressing a received wisdom. The statements are no more than  ->-bleeped-<- writ large: but are they correct?