From a man's pov(and even some women may think this), I think the idea of a sexy android is cool; but I do agree with some points that once that android gets rights...then things start getting shaky.
Too, if androids begin to learn, they will start asking for rights even though some humans (natural born beings) may not think of giving them rights.
Good topic, btw....
Still, we're talking about sophisticated, but not necessarily sentient, machines. Everything that a human wants to experience from a partner during sex (not love, not romance, just
sex) could be programmed as a response. Even actions that seem self-initiated could be executed as a response program - you program the robot to use sensors to detect arousal, it offers to 'take care of your little ... problem.' It's not about the robot empathizing with your condition - it just knows that arousal should be responded to, and top-notch (and somewhat kinky

) programmers devise and upload those responses to its memory, to be activated when conditions are met. In the same way a hooker is only going through a programmed routine, rather than actually empathizing with her (or his) customer, the robots would; the main difference is the robots don't get bored, they don't get distracted, and they don't have any likes or dislikes - they don't get offended by their customer's requests or responses. They don't worry about paying their rent, or their pimp, or their dealer, either; they don't
care about
anything. They're just actors who act
all the time, running a script they can't forget and which has branches that are triggered by the actions of their master, whether that master is an owner or a customer. There's really no reason to make them artificially intelligent, because it's not required for their function - they just have to be well- and innovatively-programmed for their primary functions. And they can even be programmed to learn without risking self-awareness - they can catalog their masters' responses and requests, their likes and dislikes, and use that data to anticipate. They wouldn't need to be programmed to innovate, themselves, and if the customer wanted something new, surely there would be programmers capable of delivering that.
The problem of course is, that unless we first achieve a sentient, self-aware computer and recognize it, we don't actually know how and/or when a computer achieves sentience. Only AFTER there is a sentient computer, can we actually make exact (hopefully) prediction about what level of sophistication we can produce without the computer/android becoming self-aware. Until we have one, we'll simply be increasing the processing power and sophistication.
Also; like someone pointed out, we probably don't want JUST a sex toy, if we can have a maid and a cook and a maybe even grocery shopper (for the dinner) at the same time (and one price). Why waste a perfectly good extremely sophisticated, extremely expensive, android in an inactive state in a closet if it could clean for you, cook for you, guard your house for you, lift things for you that are too heavy for a human, build your children a tree house so you don't have to worry about falling and breaking all your bones, etc. etc. etc.
We now have an android that is active nearly continuously, accumulates memories, examines the environment it lives in and evaluates its role in that environment - we're very quickly expanding into the realm of sentience once again.
A good argument for making them programmable only through hard-wired connections. Another would be to prevent privacy breaches - one wouldn't want a droid with wireless capabilities that someone could use to spy on its owner. Same thing would apply to limiting its optical and aural inputs, so someone couldn't use either lights, images or sounds to affect its programming.
Of course, if you want one that a human could take control of/inhabit remotely as someone mentioned before, you rather have to. It's all about what you want to do with it.
Not quite - she wouldn't 'enjoy' the pain; at most, she would appear to enjoy it. And her sensors could be much less sensitive as a consequence - they wouldn't need to transmit anything more than the necessary tactile responses that would prevent her from injuring a person or damaging property. I'd guess there are already video games where you can 'dominate' a virtual submissive and elicit responses to 'pain,' a robot wouldn't really be any different from that, other than being solidly in the physical world.
Ah, here's the rub, now we get to the philosophy of simulation. If the simulation is 100% exactly like the real thing, and you can't distinguish the simulation from reality, is it still a simulation, or has it become reality? And if it is reality, how much do you really need for it to be more than the sum of its parts? It may not be exact reality as a human, but may very well be close enough it is no longer a simple machine either.
Ultimately, after all, we are nothing but a computer in a body with sensors ourselves. Pain is nothing but a warning signal sent to the brain by a sensor that says, "Hold on! We are about to be damaged!" And the foot that was about to be skewered by a sharp rock gets retracted quickly. The pain signals and reactions in an android could be no different.
For an android to be able to know the difference between pain and a pleasurable caress, and how to react to them, you would have to program in methods of differentiating between the two - and thus ultimately come down to how well, or not, this is not only programmed, but also built.
Here we get the major drawback of the above games you mentioned. They produce the exact same shriek or moan, and the exact same visual cues every single time. You want an android to be lifelike and real, it can't shriek the same way every time. It can't touch you the exact same all the time; like with a human it would have to do so slightly differently, or very differently every single time. To do this, you would have to put it in a subconscious nearly; make its reaction involuntary - not analyzed in a cpu and then perform this action - the action would have to be genuine. Sub processors that independent from the cpu (the conscious) detect signals from say, the skin, and tell the mouth the scream out the pain even as it sends the signal to the cpu there's pain, and only then does the cpu fully realize there is pain even as it's already expressing the pain vocally. And once more, you're heading toward a real person, not a machine.
It's why I think a sex-bot will actually be the first machine to achieve sentience and self-awareness. A butler doesn't need to know as much of its own body to do its job. A sex-bot essentially has to be built aware of its own body and how it behaves with the rest of the world from the get go. And it'll be this awareness that'll fuel the emergence of full self-awareness.
Besides, I'd guess that someone interested in inflicting pain wouldn't have much use for a droid - knowing the reactions aren't real, that there is no pain, would make the whole thing pointless, I would think. A robo-dom, sure - the human gets the pain they want to experience, delivered by a 'master' who is programmed with the exact requirements to go far enough and no farther. I admit I know nothing about BDSM from personal experience, and never care to, but I at least would believe that there is a psychological need to know that the pain you cause is real, and that would make a robo-submissive something of an oxymoron.
Inflicting the pain is just the side show. The real interest is the domination. That a submissive is willing to endure pain and humiliation to please you / obey you is just the ultimate show of how one dominates the other. And the robot will most definitely be dominated by its owner, in many ways, more so than a human ever would. If it acts real enough to seem genuinely submissive toward you and act enough like a real person there'll be lots of interest from that scene.
As for there never being more than 100, yeah, sorry, but, no way in hell. If computers keep progressing in power and storage capacity the way they are now, the same thing will be happen to the androids. You won't buy one and always keep it; there'll be a newer computer system, a more advanced body with better and more sensors to be more sensitive and to react more like a real person. When the reach buy a new one, what'll they do with the obsolete model? Trade it in for a discount on the new one and then the seller will re-sell, or will they sell it to someone else themselves? And so, you have another person with and android, and so forth, and so on. And a couple of decades later the thing will sell for near to nothing.
There you probably have something. But I still think there would continue to be enough of a social stigma to keep demand down to the select few who could not only afford the robots, but the privacy, as well, and other than them, there would probably be enterprising robo-pimps and 'adult entertainment centers' that would account for the rest, even a majority of the trade-ins and 'refurbs.'
But again; why buy an incredibly expensive sexbot to be nothing but a sexbot that is inactive most of the time, if for the same price and some extra software it will clean for you, cook for you, bring you your newspaper, your beer, your whatever it is you want? Keep itself clean! And this is doubly more so for pimps and adult entertainment? Which pimp would want to clean the sexbot of some other person's business? Let alone your brothel? And why waste the money hiring people to clean everything, if with a little extra software, the sexbots will be doing it themselves?
Then once they are traded in, these sexbots can be sold to do everything. And if the stigma is indeed so great against it (and I see this happening only in the most puritan of countries if even there) those who sell the things won't just scrap them, they're enterprising, they'll prefer to sell them and make more money. So they'll rebrand them - make them less attractive, put them in bland clothes, and they are maids and butlers and no longer sexbots. They could even remove the sex-programming and remove most ways for easy lei-person reprogramming / uploading new software; thus proving to any potential witnesses the machine is indeed no longer a sexbot, and removing any potential embarrassment and reputation problems.