Oh, the World of Sports! Well, that's a relief.
It would be akin to a farang not knowing his hot new Thai girfriend is a ladyboy until he unwraps the package.....
I see. Well, it would be like that only if this internet deceiver went to tremendous trouble to make himself look like, smell like, and sound like a beautiful busty woman. As I understand it, there is a long and storied tradition of a 'third sex' - essentially a ladyboy - in most Polynesian cultures, including that of Samoa:
Not quite up to the Thai standard, but then, Samoans are a stocky lot..