It may shock many to learn that some normal and healthy genetic females have a penis, or at least a clitoris that looks like a penis. Actually, all females have a penis; we just prefer to call their penis a clitoris. While some object to this analogy, it is accurate from a sexual and biological perspective. A penis and clitoris are made up of the same tissues and function the same because they develop from the same fetal structure. In males, the penis is usually exposed to increased levels of androgens, one of which is testosterone, in the womb. This results in males having a more visible penis, but not necessarily a larger one. During part of their time in the womb, all females also have a very large clitoris, in proportion to the rest of their body, because of the sequence in which things develop. In the end, having a penis is not the sole privilege of men and boys, despite what society may dictate.
Source= http://www.the-clitoris.com
Source= http://www.the-clitoris.com