I have been an Amazon Associate for 15 years, as I too have Books, eBooks and DVDs on Amazon tangible (www.CreateSpace.com) and Amazon Kindle.

All clearly nude male photo/video. (I don't do new nude books on Kindle anymore, because they went through a nudity purge 5 years ago - male, female, str8, gay.)

I sell the same eBooks on Barnes And Noble Pubit/Nook, and KOBO.com.

Pubit wouldn't let me join their affiliate pgm because my site - with all the original promo for the same books - was an "adult" site with nude men!! Crazy!

Kobo doesn't have an Affiliate pgm that I have ever really determined.

Google Books might - if there's no nude photos. They purged nude photos 5 years ago, too. Not sure about sexual text, though, as mine were all tasteful naked men.