“The insertion of an original glans into an original private part, …”
His statement, “The insertion of an original glans,” refers to the second of the acts that necessitate ghusl.
The insertion of one thing into another means that it disappears within it.
His statement, “original,” excludes the glans of an intersex person whose sex is indeterminate, for it is not regarded as an original glans. Thus, if such a person inserts it into an original or non-original private part, neither of them is required to perform ghusl.
An intersex person of indeterminate sex is one whose sex—male or female—is unknown; for example, one who has both male and female genitalia and urinates through both. Such a person is considered indeterminate. The matter may become clear after puberty, but so long as the sex remains indeterminate, that person’s private part is not considered original.
His statement, “into an original private part,” excludes the private part of an intersex person whose sex is indeterminate. Inserting the glans into it is not regarded as an act requiring ghusl, because it is not considered a private part.
Thus, if a person inserts his glans into an original private part, ghusl becomes obligatory upon him, whether or not ejaculation takes place.
The evidence for this is the hadith of Abu Hurayrah: the Prophet, peace and blessings be upon him, said: “When he sits between her four limbs and then exerts himself with her, ghusl becomes obligatory.” Recorded by al-Bukhari and Muslim (1).
In one wording recorded by Muslim: “Even if he does not ejaculate” (2). This is explicit regarding