Ewwww!!!!! Please forgive me for publicly venting, but I cannot imagine anyone being stone cold sober and wanting to do this to themselves, were they on drugs? Seriously, I never really thought that Jesus asked his disciples to become eunuchs, he was just comparing the ways men became eunuchs, without commanding anyone that they had to be that way, so take it or leave it, thus:Ellis discusses the Nazarene association with castration and bloody self-flagellation.
Matthew 19:12 For there are some eunuchs, which were so born from their mother's womb: and there are some eunuchs, which were made eunuchs of men: and there be eunuchs, which have made themselves eunuchs for the kingdom of heaven's sake. He that is able to receive it, let him receive it.