My girlfriend and I are in a monogamous relationship. She continually gets BV(bacterial vaginosis) when I ejaculate inside of her vagina with symptoms showing probably twenty to thirty minutes after intercourse. When we first started in our relationship she did not have the current birth control(IUD) that she has now. My question is why does she keep getting BV? Am I re-transmitting it? is the IUD to cause? is her body rejecting me on a microbial level? When she doesn t have an IUD this doesn t seem to happen but when she gets one for what ever reason BV shows up close to it. We dated 3 years ago and I had ejaculated inside of her with no side effects only til she got her first IUD that I noticed the BV odor. Going crazy with the lack of information out there and just need some medical insight