This is a very serious and potentially frightening subject matter. Rather than repeat what experts know and recommend, we are providing the following link so that you may receive the most up-to date information from the most reliable source, the Centers for Disease Control.
Click on this link for comprehensive, accurate information: http://www.cdc.gov/vhf/ebola/outbreaks/2014-west-africa/qa.html
Update: The World Health Organization made the following post on 5/14/2015. “Interim advice on the sexual transmission of the Ebola virus disease. Click on the title for more details.