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There is a chance for you to get HIV or AIDs only if your boy friend's wife is affected with such sexual transmitted disease. Your boy friend might catch the veneral disease from his wife through sexual contact with her and he might spread the disease to you when he have sexual intercourse with you.
Or if your boy friend is having multiple partners with or without your knowledge, then he might catch veneral infection from any one of his partner and spread it to you. so make sure that your boy friend do not have any veneral infection/ disease for you to have safe sex with him.
Hope this helps. feel free to ask if you have further questions.