My Spouse Is 46 Years Old In Very Good Physical

My spouse is 46 years old in very good physical health, although he is a smoker he is very active doing construction. He had a vasectomy over three years ago and a Hernia repair last year. He has noticed that he has blood in his stools after intercourse and it has become more often, and leaves him tired for days and the bleeding last for as many as 3 days.