When Amazon first coined the strapline "Ask Alexa" for its virtual assistant, it couldn't have predicted the X-rated nature of some of the requests. "She" may boast an encyclopaedic knowledge, but research by consumer behaviour analysts Canvas 8 reveals that some users are more interested in a virtual hook-up than fact finding. And she's not the only target: the equally smooth voice of Microsoft's Cortana is getting customers just as hot under the collar apparently. From perma-smiling avatars in traditionally female support roles, to hyper-sexualised "fembots" pandering to male fantasies, the female form is everywhere in techno-world - attractive, servile and at your command. A little more conservative, but just as eager to please, is virtual personal assistant Amy Ingram, the brainchild of New York start-up X.ai.