Hi everyone!! First off, I have a g/f and a normal, healthy sex life. However, ladies, please help me out. Every since my g/f moved in, we take turn to do laundry one after one. When my turn comes, I notice some yellowish stain in my g/f's underwear. Mostly it has a dried sticky substance there and I know it's not pee...Just out of curiousity, what is that and how come most of her underwears have it?