This weeks passage comes from The Gospel of Matthew.
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. Matthew 19:12
I paraphrased this verse thus.
Some men are born without testes. Some men lose thier testes at the hands of other men. But, some men castrate themselves so that they can go to heaven. If you feel you should do this, do it.
The last phrase of this, "He that is able to receive it, let him receive it," has been misused many times by ministers to mean the Baptism of the Holy Spirit. As far as I know, this is the only place in The Bible that this phrase appears. Jesus is clearly not talking about the Holy Spirit here.
The three verses before this put the meaning in better context.
And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery. His disciples say unto him, If the case of the man be so with his wife, it is not good to marry. But he said unto them, All men cannot receive this saying, save they to whom it is given. Matthew 19:9-11
Jesus may not be talking about a literal castration. The meaning of "eunuchs" here may be closer to "celebate men" than to gelding. Apologetic websites certainly claim this to be so. I'm sure that most Christians would agree. However, Jesus makes a point of mentioning those who are born without testes and men who are castrated, so assuming that Jesus is talking about men who purposefully castrate themselves is in line with the natural reading of this verse.
Of course, there are several examples of men who have mutilated themselves after reading this verse. Boston Corbett was the man who shot the man who killed Abraham Lincoln. He read this verse and took it literally. He was tempted by prostitutes, so he cut his genitals off with a pair of scissors. Immediately afterwards, he went to church, then went to the doctor after church, because the bleeding wouldn't stop. Origen was an early Christian leader who reportedly castrated himself as well.
Castration is also practised by cults, to keep the men in line. Heaven's Gate is probably the best example of this. Skoptism is another example.
This verse also demonstrates that sexuality was seen as something bad or dirty by Jesus. That it was a sin to even think about sex (Matthew 5:28). So, to avoid thinking about or having sex, castration may be an alternative (according to Jesus).
I do not believe that sexuality is a sin. Of course there are moral responsibilities. There is no excuse for cheating on your spouse (IMO). Sexual abuse is disgusting to me. It ruins the lives of many children. However, one should not feel guilty about the sexual experiences of early adulthood. As humans we have a sex drive. It is especially strong in a young adult. Looking back, I'm glad I wasn't very promiscuous. But, I'm not ashamed of the few experiences I had. I am mostly glad that I didn't take this verse literally.