Maybe I should spit though my fingers when Daniel says, "I haven't had a bloody nose in a while!" Two in the past 24 hours. I blame video games. :) I might as well blame something, right...
The list of things that can cause nipple discharge is rather extensive but blood discharge is more concerning since the list includes infection, cancer, and Paget's disease, especially if the discharge is only from one breast
The vaginal lining thins as we age and as our hormone levels fall, so there can be micro tears in the lining during sexual intercourse, which can bleed. Since bleeding can also herald more serious conditions