The end of sex is union with God in Christ (Eph 5:32). Sexual capacity no matter our chromosomal makeup points in this direction. No matter our genetics, we all have one human nature. And Christ united to that nature through his hypostatic union. And by the Spirit, Christians with one human nature (the same as Christ’s) unite to God.

Since human nature exists, sex does not amount to either biological or chemical properties in us; nor does it amount to a fluid identification of gender.

Human nature encodes capacity and purpose into humanity. Biology and chemistry can describe our constituent parts but insufficiently do so. We need to also define our capacity and purpose.

This means somewhat controversially that whether we have an xy, xx, or xxy chromosome pattern, these biological and chemical compositions do not tell the whole story.

XXY and Sex

In particular, someone born with an xxy chromosomal pattern does not fall into standard biological paradigms of sex in which male is xy while a female is xx. Were biology/chemistry alone the answer, then we’d have a subset of humanity unable to truly fulfill their sexual capacity (xxy).

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