You can promote punishtube through
Crakrevenue. But they don't give you any content. Just banners and pop-ups.
Check out
Gammae for some good promo content. Under famedollars in promo sets, they have some Rocco Siffredie. Lots of images of girls done by big dicks.
Is that what you are looking for or images where girls are giving a good "oooh" face?