Hi JCalifornia,   According to the Harvard Health Publications, there are many causes for blood in semen, most of them not serious. You can read that article here. Dr. Jay Motola also wrote several articles about blood in the semen. You can read one of them here. There are also others who have experienced similar issues and have gotten advice from other users. Paul Durham had been experiencing blood after sex and told about his experience here.   Remember, online sites are great resources for information so that you are able to ask the important questions that will help you manage your healthcare, however they can not take the place of your doctor's solid medical advice.   I hope this helps. Please stay in touch and let us know how you and your husband are doing!Vicki M