Megapass

A Megapass or multisite access pass is a deal where companies that operate more than one website allow you to purchase a single membership and get access to more than one site in their stable. It is often grouping together sites with similar content (the best arrangement) or just lumping together all sorts of porn (good if you like to graze and aren't particular to one type of porn or another).

You can check out the megapass category for a listing of all Megapass sites.