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If a person acts with characteristics typically associated with a certain gender, they have the mental genitalia of that gender.
Johnny only wants serious relationships and to go shopping. Johnny's mental genitalia would be a mental vagina.

Shirley just goes out and hooks up with one guy after the other and pretends to want more from them, but just moves on, because her mental genitalia is a mental penis.
by Scott Banner May 08, 2011
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