PATTAYA, Thailand -- At the Miss Tiffany Universe pageant — which boasts dozens of gorgeous, lithe, smooth-skinned contestants — one thing is undeniable: Thailand turns out some of the most beautiful transvestites and transsexuals in the world. As contestants glided across the stage in glittering ball gowns Saturday night, one might never have guessed they were all born boys. Only when they open their mouths do their vocal cords reveal the truth. "Most people can't tell because I'm very petite, but when I talk, they know," said 21-year-old Wararat Saengchai, who started taking female hormones at 14 and underwent sex...