The study utilized the descriptive research design. It involved one hundred twenty guests of selected tourists? attractions in Asian countries particularly from Siem Reap, Cambodia, Ho Chi Minh, Vietnam and Taipei, Taiwan who were selected using purposive sampling from whom the data needed to answer the questions: 1) What is the level of guests? interest in bilingualism? 2) What is the level of guests? second language exposure? 3) What is the mean level of oral English proficiency as to vocabulary in terms of diction, grammar with regard to syntax and subject-verb agreement and fluency in terms of pronunciation? 4) Do interest in bilingualism & dual language exposure have a significant effect to oral English proficiency? Only one set of questionnaires and set of interview questions were utilized as major instrument in gathering and treating the data for the two areas of investigation. To maintain the credibility of the paper the questionnaire contained five-point likert scale of alternative answers after which the responses of the respondents were tallied and treated using mean, standard deviation and ANOVA to produce the counts as basis for empirical testing of the hypothesis. The conclusions were drawn and recommendations were endorsed from the findings made relative to above basic questions raised. Analysis of the data gathered yielded this conclusion: Interest in bilingualism and second language exposure have ?significant effect? on the oral English language proficiency in terms of vocabulary, grammar and fluency.