I actually never noticed you can check the top viewed movies at the major PPV outlets at the AVN website:
AVN ONLINE
Seems like the tranny niche is killing it..
Otto and Audrey Out of Control
(Supercore/Ninn Worx_SR)
2
Wife Switch 2
(Pink Visual Productions)
3
Sweet Cream Pies 4
(Third Degree Films)
4
It?s a Mommy Thing 2
(Elegant Angel Productions)
5
She-Male Bukkake
(Robert Hill Releasing)
6
Transsexual Swingers
(Robert Hill Releasing)
7
La Guerra De Las Trasvestis
(Cine X Latino)
8
Transsexual Sistas
(TransErotica/Juicy)
9
Porn Fidelity?s Baby?s Mommas 2
(Kelly Madison Productions)
10
Die Macht Meiner Fotze
(Create-X.tv)