Marius Theodore Gustavson, from Tottenham, is among eight others who are alleged to have performed the extreme modifications on 13 alleged victims.
The procedures were filmed and uploaded to the eunuch maker website he ran, and subscribers would pay to watch, Westminster Magistrates’ Court heard on Wednesday.
Gustavson, 45, is said to have been the ringleader in a wide-ranging conspiracy, involving up to 29 offences of extreme body modifications, the removal of body parts, the trade in body parts and the uploading of videos.
He was charged with conspiracy to cause grievous bodily harm with intent between January 1, 2016 and January 1 last year and five counts of causing GBH to five alleged victims.

The GBH charges include the removal of a man’s penis, the clamping of another’s testicles and freezing of a leg which required amputation.
He is further charged with acquiring or possessing criminal property, making an indecent image of a child and distributing an indecent image of a child.
The court heard Gustavson, who appeared in the dock in a wheelchair, has had his own leg, penis and nipple removed.
He appeared alongside Peter Wates, 65, from Purley in south London, who is charged with conspiracy to cause GBH with intent.
Wates is alleged to have been involved in nine of the 29 incidents while Romanian national Ion Ciucur, 28, who works in a hotel in Gretna Green, Scotland, is said to have been involved in two.
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Ciucur, who appeared separately, faces the same count of conspiracy to cause GBH and all three men were remanded in custody ahead of their next appearance at the Old Bailey on April 19.
Three other men – David Carruthers, 60, Janus Atkin, 37, and Ashley Williams, 31 – who are all from Newport, in Gwent, South Wales, appeared at…

