#1 Adult Ad World from Adult Ad World
(adult ppc/cpm) (Alexa rank: 223)

#2 Double Pimp from Double Pimp
(adult ppc/cpm) (Alexa rank: 846)

#3 Ero Advertising from Ero Advertising
(adult ppc/cpm) (Alexa rank: 1,762)

#4 Exo Click from Exo Click
(adult ppc/cpm) (Alexa rank: 2,768)

#5 FPC Traffic from FPC Traffic
(adult ppc/cpm) (Alexa rank: 5,164)

#6 Juicy Ads from Juicy Ads
(adult ppc/cpm) (Alexa rank: 6,447)

#7 Buy 404s from Buy 404s
(adult ppc/cpm) (Alexa rank: 9,737)

#8 Pro Traffic from Pro Traffic
(adult ppc/cpm) (Alexa rank: 16,755)

#9 Exit For Cash from Exit For Cash
(adult ppc/cpm) (Alexa rank: 18,804)

#10 AVN Ads from AVN Ads
(adult ppc/cpm) (Alexa rank: 65,515)

#11 Erotiq Sex from FPC Traffic
(adult ppc/cpm) (Alexa rank: 245,982)

#12 Warning Pages from Warning Pages
(adult ppc/cpm) (Alexa rank: 298,776)

#13 Premier Blind from Premier Blind
(adult ppc/cpm) (Alexa rank: 405,753)

#14 Sell Gay Traffic from Sell Gay Traffic
(gay - adult ppc/cpm) (Alexa rank: 477,649)

#15 Sensi Click from Sensi Click
(adult ppc/cpm) (Alexa rank: 522,183)

#16 Search Boxxx from Search Boxxx
(adult ppc/cpm) (Alexa rank: 523,172)

#17 Adult Ads BIZ from Adult Ads BIZ
(adult ppc/cpm) (Alexa rank: 1,657,396)

#18 H Clicks from H Clicks
(adult ppc/cpm) (Alexa rank: 1,752,251)

#19 GB Cash from GB Cash
(adult ppc/cpm) (Alexa rank: 8,542,522)

#20 Spot Brokers from Spot Brokers
(adult ppc/cpm) (Alexa rank: 19,122,861)

Source: Biggest Ppc Sites @ WhoPaidMe