'hidden' sales page - subfolder or subdomain?

Hopefully I'm posting this in the correct forum, if not mods please feel free to move it.

I own a website and a product that is working well, lets call it mywidget. It's on google, bing, twitter etc - I'm running a clean adwords ppc program - all very nice.

I've found a niche adult market that I'd like to sell the widget to, but don't want the main website to have anything to do with the niche market.

A single page sales page is ready to go - buy now button goes directly into paypal instead of my main store checkout. I will promote the adult niche on only on adult ppc networks.

Should the sales page be on a subdomain or a sub folder?

should it be...

niche.mywidget

mywidget/niche

The niche customer can know about the legit side of the business, but the legit side can't know about the niche.

I plan on setting up the sales page as nofollow, no index etc. I do not want the niche sales page to show up in google or any search engines.

What is the best practice to keep the niche separate from the main site and also not have too much leakage from the sales page?

Any advice is appreciated.

Cheers,
jellio

If you truly don't want it associated with your original site, why not get an entirely different domain for it?

Wouldn't that throw off the visitor - the url wouldn't match the product.

Maybe I'm over thinking this, maybe I'm missing something.

Is there a standard 'best practice' for doing this sort of thing?

So you don't want your non adult traffic to know that you are promoting an adult product?

Just don't link your landing page for the adult product from anywhere else from your main site. How will your non adult traffic know the page is there if you don't link to it from anywhere else? Do you understand what I'm saying? They won't know it's there, unless you tell them it is.

this way, you can use a landing page that you only promote externally through your adult traffic sources. They will be able to see the rest of your site (if you want them to) if you link to other pages on your site.

or like I said, if you want it truly separate, get a different domain and have all your adult traffic go there, and the non adult go to your main site like it is right now.

Thanks - that all makes sense, I just didn't want it showing up on google. I've setup the page to block search engines but I'm just extra cautious.

thanks again.

I would buy a new domain