Please answer me!

My boyfriend and I have been very sexually active. He's the only men I have been with since we are together. Lately I have been having very unsual odor "down there". I read about it the other they and it says that when a man cums inside you those odors. I don't feeli itchy, just the odor. Please someone tell me what it's happening and what can I do to take away the odor. Thank you.