I am 26yrs of age and for the first time I am having an affair with a married man. My question is this, I have been tested for all possible STD's and HIV/ AIDS and my results were negative and so has he and his wife. If all three of us are negative to all teh above mentioned, Can I now contract any STD (PID, etc.) as a result of this union. I know for a fact he doesn't use condoms on both of us, however I have take precautionary measure to prevent pregnancy.