Could this be part of it.

Tetragametic chimerism, as it affects homosexuality and transgender identity, is properly termed macro-chimerism since, in theory, it can be hexagametic or more, if more than two embryos merge.[6] But since male cells outgrow female cells in this condition, the majority of male/female chimeras should be phenotypically male.[6] Since the majority of any organ tends to be made from one embryo or the other, while a mixed-sex brain could occur in any proportion, generally the brain would be primarily male or female.

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