If it were me, I'd start by identifying the sites that rank on top of Google for your main niche keywords like "puerto rican porn", "native americna porn", etc... (Surprise, it's pornhub, xvideos, youporn, and xhamster).
From there I'd try a bunch of low budget banner campaigns on the closest niche tag you can get (they only have the major ones available like latina).
If the max I was willing to pay for a sale was $30, I'd budget $300 per spot to watch the data and make tweaks. At the very least you should be able to track the banner the user clicked on, and whether they clicked on anything once they landed at your site.
Media buying doesn't have to be expensive, you could have a campaign with a $20 daily budget that runs from 6pm-midnight wednesday-saturday in Florida, and if it makes sales that's ok. Rinse and repeat.
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