Adult pay site

I would like the backend php scripts and database for an adult xxx pay site I am designing. I've already got the graphical frontend made waiting to use. It will need to have the usual adult site features, hopefully someone will have a premade script that can be installed and customised. -Image and video gallery. -Members are able to sign up for paid accounts. -The ability to create a trial membership. -admin area to allow usermanagement etc. -An easily updated welcome message area on frontpage. Any help with suggesting a company happy to accept credit card payments for this type of site would be a bonus.