Female Transformer
Despite being robotic lifeforms with generally non-sexual methods of reproduction, the Transformer species has almost always been shown to include both male and female gender analogues, at least mentally if not physically. Female Transformers are usually portrayed as comparatively rare, but are considered an official part of the Transformers franchise in every continuity.
Appearence
The appearence of Female Transformers in most continuities would seem to suggest a level of "sexual" dimorphism is present in at least the more humanoid members of the Transformers species (the term sexual is used in a gender-based, rather than physical sense, see the reproduction link above for that whole kettle of robo-fish). In almost all cases female Transformers are portrayed as comparatively more gracile of form, and more rounded and curved in general, than their male counterparts. Often they have a more than passing resemblance to an attactive human female made of metal and wearing armor and kibble, though there are exceptions to this rule, and bulky, less human-like females have been seen from time to time (notably Strika and Discharge, though the latter is said to be wearing armor that obscures her true appearence.)
Fiction
Generation 1 animated series

Only female Autobots are ever seen in this continuity, and given the appearence of Beta back in the slave days under Quintesson rule it seems clear they were produced alongside the male Autobots as part of the Quintessons domestic product line, likely for those races that prefered female-style servants. It seems from all evidence (though it is not confirmed) that the millitary hardware line did not possess a counterpart to this, thus no female Decepticons are ever seen.
Generation 1 Marvel Comic
No female Transformers are ever seen in the US stories. The UK stories specifically establish that the Transformers have no gender naturally, and Arcee is created as the sole female Transformer in an attempt to placate human feminists. (This series is surprisingly alone in declaring Transformers to be naturally gender free.)
Transformers: Victory manga
Beast Wars
In Beast Wars, Rattrap makes numerous innuendoes, especially involving Silverbolt and Blackarchnia's relationship, that suggest that, at least by that era, there *may* have been something sex-like between TFs.
=Beast Wars II
Beast Machines
Beast Machines' Technorganic reformating raises even further questions. It is possible that the Technorganic female Transformers, being merged organic and technological life to a cellular level, might actually be physically female and capable of bearing young, but that remains speculation.
Dreamwave comic continuity
According to DK's Transformers: The Ultimate Guide, "Transformers are inherently non-gender specific, and only some quirk of their timelost origins can account for their (female Transformers) difference in appearance and attitude." Dreamwave was in the process of introducing more female Transformers and explicating their links to the Quintessons in this continuity when it went out of buisness.
Unicron Trilogy
IDW Comic continuity
Simon Furman has stated that he will not use female Transformers in the IDW continuity untill or unless he comes up with a reason/way for them to exist that makes logical sense to him. He did not rule out doing so however, as he said he had found a similar justification for the Pretenders, which lead to the Stormbringer miniseries.
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