I've got a fairly okay thong domain as well and there aren't as many true bikini type sponsors out there as you would think. Here are some of the ones I use:
TNA Cash - The Teen Kelly and Nevada bikini galleries are nice.
Oliver's Money has some nice hosted bikini galleries.
Of course
Adult Platinum has a ton of galleries and content.
I just started a little with
Voyeur Dollars they have hosted content etc.