According to Alexa.com:
XBiz.com: 12,873
AVN.com: 15,895
Lukeisback.com: 28,570
Adultfyi.com: 82,458
XFanz.com: 83,004
According to Snapshot (Compete.com):
AVN.com 21,648
LukeIsBack.com 22,972
XBIZ.com 38,363
XFANZ.com 75,421
AdultfFYI.com 138,483
According to Quantcast.com:
AVN.com: 15,518
Lukeisback.com: 22,420
XBiz.com: 34,151
XFanz.com: 85,697
Adultfyi.com: 227,728