Sponsors with good descriptions for their FHG, with sites in the niches you mentioned:
Pimproll - Sweet Legs And Feet, All Hairy Girls, My Cute Panties, My Stocking Secrets, Knocked Up Nina, Bareback Beginners, Creampie Guys, Cum Swap Guys, Ebony Knights, Gay Dream Boys, Gay Player, Hot Gay Porno, Prime Man Meat, Pure Asian Men, Stunning Studs
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Brain Cash - Pornstar Squirt, Swallow Squirt, Real Squirt & More
Octopus Cash - Yellow Stories, Nylon Flow, Fetish Puzzle