The induced state where a male loses the use of their testes, or reproductive glands, through medical and/or chemical means.
The surgical practice of removing the sexual organs of another person, due for either medical, social, or religious reasons.
This is today generally a form of medical practice, such as in the case of Testicular Cancer, Prostrate Cancer, and in the case of gender modification. A man to a female as an example.
Social castration is seen today as a possible means to rehabilitate serious sexual offenders, as castration eliminates that person's sexual urges.
Religious castration are rare today, except perhaps in some off the wall cult. It was popular in some mainstream religious orders in ancient times.
In ancient times it was used as punishment, and of taking of power from the defeated. It also was to insure the end of a blood line, and to promote a different blood line, specially over those vanquished, in battle.
Some instances it was for religious purposes, to insure they weren't tempted by the sins of the flesh. This was in very early Christianity actually.
In other instances, as women were not allowed to participate in Choirs in Churches, many male singers were castrated, in order to maintain their pre puberty voices, or to insure the tone.
Castration was used for social reasons as well, in ancient times, and is recorded in many European, Middle East, African, and Chinese historical references.
It was also a practice for many cultures to staff their higher echelons of government with Eunuchs, or Castrated Males. While they are mostly known for their attendance or protection of the females of the upper elite of local society, they were also employed in other departments of the household.
Some speculate this was done, so that they would focus more on their duties, rather than on the matters of the flesh.
The death rate however, was high, as in those days, the general rule was the total removal of genitalia, which generated massive blood loss, and a high risk to infection.
Both Judaism and Islam frown on castration, and in fact in Leviticus Holiness code, castrated males, or those with deformed genitalia were forbidden to enter the Priesthood.
In Imperial China, it was routine that when a person was castrated, to enter the Eunuch Cast, their removed organs were preserved in jars, and were allowed to be kept next to them, in their sleeping quarters.
The removed organs were to be buried with them, upon death, so that they would be able to return to the world again, as full males, not Eunuchs.
Yes there is a sexual form of this type of action.
For the most part, this is a 'impact role playing' scenario, which involves the administration of pain, to simulate the forcible castration of the submissive persons.
This role playing should be done under careful supervision, as it can have unforeseen risks.
It is not a major facet of role playing, but in some extreme instances, it has been used to further stimulate the participants. The concept being to SIMULATE the act of Castration, which in ancient times was the full removal of the genitalia.
It is also believed to be part of some extreme forms of 'edge play' in the BDSM culture. Which involved the use of sharp objects, knives, etc.
Noteworthy: Castration has also been used as a form of punishment, for those convicted of sexual crimes. Today there is a growing trend to allow those convicted of repeated sexual crimes, to undergo voluntary castration, either medically or chemically induced, in order to be given reduced sentences, or in some cases, release from custody.
The idea is growing in popularity among Western Civilizations, as the number of sexual crimes increase, and prison populations rise.
Alan Turing was given a form of Chemical Castration in 1952, after his conviction of 'acts of gross indecency'. It was his punishment. It was believed that a side effect of such an effect led to his suicide. The acts of gross indecency was not rape, but of homosexuality.