The best policy is to do what you should do anywhere in the world and not have unprotected sex while visiting Kenya (unless you brought the person). Get the necessary shots for the things that your Dr. says (you can also check with the Atlanta Center for Disease Control (on the links page) for the latest update. Just know they always err on the side of safety and are very conservative.) And take your Malaria pills. Don't worry about Ebola, there isn't any in Kenya.