Parsed documentation:
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sex (http://rs.tdwg.org/dwc/terms/sex)

@return [String]
The sex (gender) of the taxon for which the vernacular name applies
when the vernacular name is limited to a specific gender of a species.
If not limited sex should be empty. For example the vernacular name
"Buck" applies to the "Male" gender of the species, Odocoileus

Vocabulary: http://rs.gbif.org/vocabulary/gbif/sex.xml

Example: “male”
Please help! Open an issue on GitHub if this assessment is incorrect.