AVS Services

These "adult verification services" sites used to be popular back in the day. They've since now practically disappeared, but they were a big money maker back in the day. The way it worked was like this: a surfer visits a gallery, gallery links to a small tour/site. That site is part of a huge network of small sites. The surfer pays one monthly membership fee and gets access to all of the small mini sites within the network. This worked great for micro niche sites.