But he said unto them, All men cannot receive this saying, save they to whom it is given.
Today, a eunuch is typically defined as a castrated male, which is actually incorrect. Castration means to remove the testicles (that were already there) or emasculate. If all eunuchs were castrated males, Jesus would not have said “were born from their mother’s womb.” The classic definition of a eunuch is a man who has no desire or ability to have sexual relations with a woman. These men were commonly used to protect the harems.
Jesus addressed three types of eunuchs. Those born that way, those made by men (either castrated, or were sexually abused), and those who decide not to have sexual relations for the sake of the Kingdom.
So Jesus stated that not everyone will marry according to the custom as in ‘male and female.’ He also said that not everyone can accept this. Then finally, those that can accept it should accept it.
When He said “born that way” (NIV) it is conceivable He could have been referring to intersex people, although intersex identify as either straight, gay, or asexual, and sometimes have active libidos, so would likely not have been chosen in ancient times to (for example) protect a harem. It is however unreasonable to assume He was referring to impotent people since impotence is a psychological and/or physical condition which is sometimes medically corrected, and most often happens to a person in adulthood, not in childhood, and certainly not ‘at birth.’
Whether referring to non-heterosexual orientations, or to intersex, or both, Jesus was most assuredly acknowledging that some people were not meant to follow what is considered the usual male/female sexual roles according to the bodies they were born with.