recently i have had a slight white discharge durring sex. i dont know if i just never noticed it or what is going on. there's no discomfort of any kind (swelling, blisters, rash, painful urination). in the last year ive been with one woman and i know that neither of us had an std when we got together. we are only involved with eachother and ive always used condoms every time. i show no signs of any stds, what could this be?