Any day I have sex with my wife the following day she will mensturate and its everyday so I will like to know what's the cause of that pleade. Thanks?

Bleeding. There may be a problem with the cervix, which is the opening into the uterus. There could be an infection or a growth on the cervix that is being aggravated with the sexual activity. It is strongly recommended for her to be examined by the doctor to be sure it is nothing more serious like a tumor.