One domain? Multiple domains? What do you use?
 

When building sites or submitting galleries do you use one domain or multiple domains? I've always been curious about this.

Is it best to do style 1 or style 2

Style1
analdomain.com/analsite/
bondagedomain.com/bondagesite/
teendomain.com/teensite/

Style2
or is it better to do
domain.com/niche/sitename/

It seems better to have multiple domains, but the problem there is organization. You could be more organized with just 1 or 2 domains.

or domain/sponsor/site

multiple, but I don't think that it really matters :)

well I've heard some people using multiple and matching the niche and I was just wondering why. SEO maybe?

I use like niche.com/sponsor/sitename/ for AVS and use the domain itself for pay style sites.
I'd go crazy registering a domain for every site.

I do domain/sponsor/site for avs
and domain/sponsor/site/free for the free site version

I build a ton of free sites on one domain, but I also have a lot of domains. I used to get expired domains a lot.. :)