Some studies showed RNA in semen for prolonged periods, but I only know of one study where viable virus was found in semen after 82 days (Bausch et al, 2007). It was viable by cell culture plaque assay. Just finding RNA in semen does not mean anything, since RNA alone is not viable.
Filovirus can also be found in breast milk and the intraocular fluid (whatever the name of that stuff is called) for prolonged periods after recovery. I doubt that the intraocular fluid is much of a transmission hazard...
For that matter I don’t even know if such crippled virus particles would act as an infectious agent or more like a weakened virus (think live polio or rabies) vaccination.
I’m not willing to do the experiment...