A trained psychologist could probably say a lot about our society's fascination with hot female robots. In fact, the inability to produce a lifelike female sexbot was named as the single biggest scientific failure of the modern era in one survey of Cracked.com staff.
A closer look at lady-bots as portrayed in film may give us reason to reconsider ...
5Terminatrix: Terminator 3: Rise of the Machines
While Skynet began its campaign to send robots to exterminate the human race with Arnold Schwarzenegger, each robotic assassin since has looked more and more effeminate since. This is probably because even a Speak-and-Spell knows that humans will forgive a lot when it comes from a smoking hot blond wearing a red leather outfit that looks like she was poured into it. Or failing that, vaguely handsome character actor Robert Patrick.
Ever since the second film, evil Terminators have come with morph-like shape-shifting abilities. In T2 they just make weapons out of their forearms, but that doesn't mean they're all work and no play: at one point in T3 the Terminatrix increases the size of her breasts to distract a policeman who pulled her over. If, at the thought of having a girlfriend who can enhance any part of her body at will makes you say, "Hey, that could get us out of countless traffic tickets!" then you're probably not using your imagination enough.
There is the thing with her ultimate goal being the death of all humanity, and she seems to really enjoy her work: in order to "analyze" her victim's DNA, she has to lick their blood. (More machines like this would make watching CSI infinitely more enjoyable.) We're not saying you shouldn't have sex with a Terminator, we're just saying that you really need to establish a "safe word" first. Also ...
... we're pretty sure they didn't have a reason to include genitalia in the design.
Note: While we are aware of a similarly hot Terminator in Terminator: The Sarah Connor Chronicles, we expect, and hope, that the show will be canceled very, very soon, and so we'll not be including her in this list. Except to say that Summer Glau, who plays her, is very attractive, and should feel free to call us at any time.