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Why do female Transformers exist?
As Transformers are not a biological race and do not reproduce in the traditional way one would expect from a race with male and female distinctions, the debate of precisely why female Transformers even exist is often brought in the fandom, and can be a particularly heated point of discussion, particularly since cartoon and comic continuity differed so wildly on it.
It is very clear that the difference between male and female Transformers is much more than the shape of their bodies - it is a cultural and mental difference, with each "gender" possessing - in a general sense - the typical traits of the individual sexes. Furthermore, the two genders feel attraction to one another, to the extent that romantic relationships exist between certain members.
There is no precise, officially-given in-story explanation for why females, or even males, should exist - the writers of the cartoon simply wanted to create some, and since Transformers are already very humanised (possessing bipedal bodies of humanoid construction, five fingers, and, usually, the traditional human facial structure), the addition of females to the race is not a leap.
In-story, however, it can be rationalised that the gender-based designs are a result of the work of the Quintessons, who created the Autobots to be consumer goods. Logically, then, a female-styled robot would be visually and culturally more acceptable to perform certain tasks for the purchaser (perhaps a housemaid or a nanny). This also helps to explain the complete lack of any female Decepticons in the cartoon continuity, since the faction was created to be military hardware, a function that would have little use for a female-styled form.
http://en.wikipedia.org/wiki/Female_Transformers
