Non-Whites and STDs

It's a fact that the world's non-white population carry the most STDs. Why? In the days of Pokémon Cards (aerodactyl, and so forth), STDs never crossed my mind, but now Non-Whites are populating at an ever fast rate, and STDs are on my mind. Why do STDs occur mostly in Non-Whites?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums