why does Brazil have a large TS community?

[Ekarth]

It's more related to production costs.
and from wiki- In the last 10?15 years, numerous American and European actors such as Rocco Siffredi, Nacho Vidal, and John Stagliano have visited Brazil to produce movies which, like most American pornographic productions, are shot without condoms (contrary to native laws requiring them).

Rocco's house is also involved in shemale movie production hence you see a large number of titles from Brazil.