Hello The most common mode of transmission of HIV infection is homosexual ( as may be in your case?????). As you mentioned that sexual episode was some 6 years ago . As I mentioned earlier this is a most common way of transmission of HIV If one partner is HIV infected ( but not sure ) but it depend on many factors as advanced-stage disease , more virulent strains of virus and antiretroviral treatment , time taken during exposure ( less time , less chance ). In your case I would like to say if you would have been HIV infected , the symptoms may have appeared much earlier . Approximately 50-70% of HIV infected experience acute HIV syndrome , these symptoms are: Fever , pharyngitis, lymphadenopathy, headache / retro-orbital pain, arthralgias/myalgias, lethragy/ malaise, anorexia / loss of appetite , nausea/vomiting/diarrhea. Other are erythematous maculopauplar rashes, mucocutaneous ulceration. While in chronic cases ( if you would been case ) Fever ==1 month lymphadenopathy generalized==1 month, diarrhea==1month, herpex zoster recurrent , herpex simplex , weight loss , tongue coating and mouth ulcer . Generalized weakness . But in your case , you are not having such type of symptoms , so need not to take tension. If few of these symptoms , you are having , get in ELISA test for HIV confirmation. Hope this will help you.