Umm. So what? I can expect a 3 day ban for not answering correctly? :p
The "..." almost make a threat.
What, an ellipsis is threatening? That's a new one.

And yes, it's possible to set up a website like this.
There must now be an really really good excuse why not to go this way.
Why not to please more people while at the same time not making more feel offended.
Because that's not the website we want.
We don't want to segregate nudity.
That certainly wouldn't please me, nor would I imagine it would please a majority of users. It's never come up as a request in the annual surveys (to my knowledge), whereas the nude thumbnails has been brought up time and again.

And I'm not talking about all kind of products. It's fine if there are 4 MP's, ReRo, DAZ, Renderotica, and some MP solely for architectural stuff.
OK, so you approach PoserPros, Raunchyminds, PoserCorner, Netherworks, RuntimeDNA, and all other "small" markets you can find and ask them to close down because you'd prefer to just visit 3 websites. You let us know what they say ;-)

Or better yet, approach the people who sell their products at those sites and ask them to move to Renderosity (or Daz, or Rotica) because it makes your life easier, and see what they say.

You're trying to deny market forces. This is capitalism at work, my friend. People will broker where they want to and buy where they want to. It's voting with your wallet - democracy and capitalism hand in hand. No?

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire