I think the design should be secondary to the porn. In my experience the more amateur (but still organized) a page works the better it converts. I think most surfers are at the lower end of the IQ range so it's best to make things dumby proof and EXTREMELY SIMPLE.
This includes scrolling -- some might not even know how to scroll from side to side, some can barely operate a mouse
16% of the market is very huge, and you're also assuming that people will view your site at full screen. What if they don't want to?