I would guess that he's not attracted to plain old beach balls. Which makes me wonder what the anthropomorphic threshold is between attraction to inflated object or no attraction. Is it the shape of the thing? If it has eyes?
No, he bangs those too. The attraction is that they don't say no or run away. Like realdolls but he can afford them while living mom's basement. Plus there's an online community to reinforce the behavior.
The sad part of this show is that everyone seems to be reading from the same script.
They logically attempt to prove why the fact they are doing these strange (and potentially destructive) things and inevitably they all say "I do not see myself not doing X". These people are propositioned by the show and I'm pretty sure most of them see it as a challenge to not let go of their addictions because of that.
My favorite was the one that has the girl fixated on a stuffed lamb, and when her friend tells her that she'd be better off without the lamb, her response to the camera later is "She doesn't understand my relationship with the lamb, how could I possibly be better without him?"
Of course, it could also be made up like a not-insignificant number of reality shows these days, so whatever.