you can cum without testicles but you probably wouldn.t desire it much....They make most of the testosterone in the body which is what makes everyone horny ,male and female. If the nads are gone you would simply do testosterone treament to bring back desire...The reason they had eunichs in harems is because , although they could physically perform, they didnt give a shit once their nads were gone. I experienced that in the Navy, for extended periods of time I wasn't able to masterbate and not anywhere I could get laid, at the time I was not bi so there wasn't anything for me...my horniness just sort of went into remission...It felt like everything was just shriveling up..Once I was able to relieve myself, it all came back quickly...