By far my best sponsor is
http://www.a1adultebooks.com/ but that is only because I have a lot of bondage sites, and they are a killer profit maker in the bondage market, they don't do so well on non-bondage sites (probably because 90% of their inventory is bondage related).
However even if they were not my best producing sponsor they would probably be my "sponsor of choice" if I could only use one sponsor because I publish a few porn eBooks, and they act as distributor for me.
