Androgynous (2.5e Trait)
From D&D Wiki
You bear traits in common with both genders.
You can count as either gender for prerequisites and positive effects (such as meeting the prerequisites of a male-only Prestige Class).
You always suffer a penalty to disguise when trying to disguise as someone of a specific gender.
Androgynous people can be shunned from society, as their appearances may be confusing. Many try to look and act more masculine or feminine in order to fit in, but they aren't always successful. Others may just embrace their androgyny despite any negative reactions they may get from others.