I would suggest using one of the readily available adult CMS's find one that meets your needs and budget
I have used the following and they are all good some are better then others but you will be able to build a nice site with any of them
Carma from
www.toomuchmedia.com
ElevatedX
www.elevatedX.com
AdultSite CMS
www.adultsitecms.com
MAS
www.mansionproductions.com
I use and have clients on all of these scripts and all of them have their own ups and downs so find the one that best fits what you want to do