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In humans, biological sex is determined by five factors present at birth:<ref name="KnoxSchacht2011">{{REFbook
| last=Knox, |first=David; |last2=Schacht, Caroline | firstfirst2=Caroline | year=2010 | title=Choices in Relationships: An Introduction to Marriage and the Family | url=http://books.google.com/books?id=iVOXAp27iQkC&pg=PT64 | work= | editor= | edition=11th edition | volume= | chapter= | pagespage=64 | location= | publisher=Cengage Learning | isbn=9781111833220 | quote= | accessdate= | note=
}}</ref>
People whose five characteristics are not either all typically male or all typically female at birth are intersex.<ref>{{REFweb
| quote= | url=http://www.isna.org/faq/what_is_intersex | title=What is intersex? | last= | first= | publisher=Intersex Society of North America | website= | date= | accessdate=2013-11-18
}}</ref>
Intersex traits are not always apparent at birth; some babies may be born with [[Ambiguous genitalia|ambiguous genitals]], while others may have [[ambiguous internal organs]] (testes and ovaries). Others will not become aware that they are intersex—unless they receive genetic testing—because it does not manifest in their phenotype.
{{SEEALSO}}
* [[Intersex]]
{{REF}}