@Fuko No, it would not. The virus is targeting "either of two masses of erectile tissue forming the bulk of the penis and the clitoris." Castration has nothing to do with the penis. These tissues are not in the balls my dude. That's why the guy he asked online told him to cut it off, so the virus couldn't reach it. If I misinterpreted you, and you're saying they won't get erections with castration, they sometimes still can. Not worth the risk.
So, you mean to say that if you control it carefully it won't happen fully? I think this some parasyte reference where migi wasn't able to infect due to the stoppage in blood flow.