Enough fun (for now)...
Cis-Male/Cis-Female is defined by the configuration of the 23rd chromosome. If at least one "Y" chromosome is present, the person is "Male"; if none, then "Female"
HOWEVER...
It is possible for a genetic male to be born with female reproductive features, and vice-versa; it is also possible for a person to be born with both male AND female reproductive features (or virtually no reproductive features at all), all of which makes "Assigned at Birth" somewhat problematic.
Then there is the factor of "Male Brain in a Female Body" (or vice-versa).
ALSO...
"Man" and "Woman" vs. "Boy" and "Girl" imply levels of maturity, including the aforementioned aspects of behavioral, cosmetic, emotional, genetic, intellectual, intuitive, legal, physical, sexual, and spiritual maturity.
In other words: "It is complicated".
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.