I've seen artists who've done collabs with sex toy companies with their characters like Braeburned and Twin Tail Creations. I don't know what the revenue sharing is like though. I remember one artist saying they got approached to do this once and all they would have gotten is a free copy of the toy? Which is neat but not exactly a great deal.
Yeah, that would be silly. The whole point would be to do an ongoing profit split. But again, silicone ain't cheap, and with small-run stuff like this even more so because you don't have the economy of scale. So again, I'd probably target other, simpler stuff. That's in the future though, gotta focus on actually getting the first release of the game out first.