Different ways to look at traffic.

By how you pay:

CPC, CPM, flat rate, CPC, affiliate,

Types:

Hardcore, softcore, general,

Sources:
Search Engines, TGPs, MGPs, Tube Sites, p2p, blogs, CPC, linkdumps, forums, email

Ad Type:
popunder, popup, layover, pagepeel, banner, text ad,

XXX Traffic varies wildly by type, source, geography, behaviors, and even time of day. There are also a wide variety of terms that are used to define adult traffic. From hardcore meaning general adult traffic, to softcore, or even non-nude which can be misleading, to straight traffic, gay traffic, bisexual traffic, mixed traffic. Other source type are things such as clicked traffic, skimmed traffic, tube traffic, TGP traffic, MGP traffic, SEM traffic or CPC traffic, babeblog, moviepost, linkdump traffic