White Discharge During Sex

Riane
I almost always have white discharge whenever my boyfriend and I have sex. It's thick and lotion looking then turns flakey when dry. I don't think it's as a result of ovulation or anything of that sort considering we have sex pretty often. We use condoms and he pulls out before he nuts as an extra safety precaution so it can't be from him. It also is not a result of an STD because both of us are clean and loyal to each other. Is this normal? Does anyone know what this is???