Why does it seem like there are more Mexican and other Hispanic transvestities (m to f) than any other ethnic?

group? It just seems that way, for instance "Gwen" Arujo. I live in the San Francisco Bay Area and it seems like there are more Latino transvestites than other ethnic groups of transvestites. Which strikes me as ironic b/c I think Latin-american culture, and the different subcultures within it, (i.e., Mexican, El Salvadorian, Peruvian, etc.) are very bent on maintaining gender roles, such as the whole "machismo" thing, where the guy acts very masculine and tough, and the women are expected to be nurturing and domestic. Is it from this that transvestites come about, because the culture they come from is more stirct on gender roles? Is this still true of Latin culture in different places in Latin-America, that ideally men are to be masculine and tough and the women feminine in that they are nurturing and have and raise children?