I don't know about your situation, but I do love promote adult product or stuff online. This is simply because the adult niche has enormous traffic than any other network, I bet. Everyone love to watch porn so there is no demographic formula or age(18 to 60+) range. Also, there are too many physical products as well. So if you are love to promote a physical product I suggest you why not try once. Summary is I love to promote adult stuff because it has huge traffic. Why you?