we've been on and off for the last 4 years. I have been with two other men during that time. But each time after i have a new partner, I get a bacteria infection. The very first time, it was with my ex and we didn't use protection. The second time we used protection but i still got an infecion both times. So do anyone have any input on what causes bacteria infections after new sex partners. I have gotten tested so its not a STD, its been a bacteria infection both times. Recently, i was with my other friend and i noticed a slight discharge and i had another darn bacteria infection. Someone please give me some input.