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gender

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > gender

Gender of the person. While http://schema.org/Male and http://schema.org/Female may be used, text strings are also acceptable for people who do not identify as a binary gender.
Values expected to be one of these types
GenderType
Text
Used on these types
Person
SportsTeam

Source

https://github.com/schemaorg/schemaorg/issues/2341