After going through menopause (about 2 years ago), I started having rectal bleeding. Most of the time there are large bloody clots on the paper. And it is all bright red. This usually happens about once a month, like a period.  Well my husband left in October and it stopped.  Completely.  Now he is home, we had sex, and the bleeding is back. The sex is totally missionary position, with me on the bottom, nothing rough, nothing different in the last 30 years. Oh, and there is no pain associated with this at all, and he has a small penis.  So my question is: What are possible causes and what can I do about it? I don't mind not having sex, but I don't think he would approve.