I found this interesting:
http://en.wikipedia.org/wiki/Gender-...Middle_English
Historically, there were two gender neutral pronouns native to English dialects, "ou" and "a", but they have long since died out. According to Dennis Baron's Grammar and Gender:
In 1789, William H. Marshall records the existence of a dialectal English epicene pronoun, singular "ou": "'Ou will' expresses either he will, she will, or it will." Marshall traces "ou" to Middle English epicene "a", used by the 14th century English writer John of Trevisa, and both the OED and Wright's English Dialect Dictionary confirm the use of "a" for he, she, it, they, and even I. This "a" is a reduced form of the Anglo-Saxon he = "he" and heo = "she"
—Dennis Baron, Grammar and Gender[8]
Baron goes on to describe how relics of these sex-neutral terms survive in some British dialects of Modern English (for example "hoo" for "she", in Yorkshire), and sometimes a pronoun of one gender might be applied to a person or animal of the opposite gender.