The virus is not spreadable until symptoms are present. I personally think sex would be the last thing on an infected persons mind if they are vomiting and have diarrhea. I also wouldn't want to have sex with someone if they were displaying those symptoms.
So if you think you or your partner have Ebola, please refrain from sex! Even if you think your over it, hold off for a few months.
The disease can also cause long term inflammation of the testicles.