After many years of watching other men do it, I went to a fishing bait shop, bought a big supply of nightcrawler worms and started using them as a masturbation technique. I rinse them all off from their dirt packing and dump them onto my cock and let them squirm around.
Another one that completely surprised me was developing a kink for manure. I absolutely abhor any degree of scat play between humans, so I avoid any mention of that. But somehow after going through so much farmer content to see men with their livestock, I noticed I was getting very excited to see guys stomping around in mud, muck, and manure in their stables. So I explored furthermore and now really love to see men in gear or nude, rolling around in manure pits, especially in thick piles and guys who are raunchy enough to hump/fuck the pile like a fleshlight.