That's an entirely different discussion than what we're having here though, isn't it?

It's not "An android that is functionally and behaviorally indistinguishable from an actual human", which in itself brings a whole host of concerns and discussions - see the countless volumes of discussions and concerns on the rise of artificial intelligence and manufactured sentience, and the implications of "banning" what would be a sentient and arguably living being from the right to existence or free will - but a robot whose function is to provide sexual gratification/release.

I can't help but facepalm over the basic presumption by the Author that such sex robots would exclusively exist to "service" men.

What about women? Women are not sexual objects, for sure. They're living, feeling, thinking, conscious humans as well, but they also have sexual desires and urges. In my experience and understanding, they are comparable to men in this respect, despite the stereotypes that persist in modern society. Just look at the MASSIVE industry that exists specifically to address the demand for female sex devices (and lubes and oils and outfits and erotic literature etc).

We have the real use of women and children in the real world (as sex objects)

This is true. Men (and boys) are also subject to this.

this [sex robots] kind of paraphernalia reinforces that message

Debatable, but for the sake of argument let's assume that's true. In who does this kind of technology generate or exacerbate this kind of behavior (the "use" and perception of people as the sexual objects)?

Is the presumption that this is going to turn mentally stable people into pedophiles, rapists, and other sexual deviants? And if so, why is the nature of the discussion implying that only men will be at fault/susceptible to this?

The problem is not the robots, sexual devices, or the like, but the select few that are mentally unstable. They are the ones that should be addressed as the problem, and something most definitely should be done about treating them. A good first step would be admitting that the issue is neither gender specific, or purely the fault of technology itself. And let's not immediately jump to cramming pills down their throat or tossing them in jail. Let's focus on finding actual treatment and prevention methods and determining what we, as a society, can do to address the problem of rape and other non-consensual or uncivilized sexual behaviors. We can start by not making this a gendered issue.

EDIT: fixed typos and clarified a few things.