Extremely Masculine (3.5e Trait)
From D&D Wiki
 Extremely Masculine
You are disturbingly masculine, and people tend to believe you to be a guy, whether you are or aren't.
Benefit: +8 bonus to checks made to Disguise yourself as a male.
Drawback: -8 penalty to checks made to disguise yourself as a female. Furthermore, if you are not male and not actively disguising yourself as a male, people who meet you must suceed on both a DC 18 Spot check and a DC 18 Will save to notice and believe that you are not male.
Normal: You are not disturbingly masculine, and people don't mistake you for a guy if you aren't.
Special: A character with this trait may not have the Feminine trait, the Masculine trait, or the Extremely Feminine trait.
Roleplaying Ideas: Characters with this trait both look and act so masculinely, that it can get a little disturbing. If they aren't male, they may be exasperated that they keep getting mistaken for a male.