Careful STD's are really easy to get, even with protection. AIDs is also very popular in Vietnam as well. Its not worth it man! Remember a condom doesnt protect against all types of STD's and some are uncurable and untreateable. After taking a human sexuality class, I am totally freaked about STD's and what they can do. Gosh some pictures would make any man fall to his kneee and beg for a quick death!
Best of luck