anus scent is very popular these days. you can buy it in a gel, liquid form in a bottle just like any other scent, it's also an option in scents with most artificial baits 4 steelhead. steelhead like it just like shrimp or krill scents, they do smell it when they are paired up and spawning. if you want to improve your steelhead catch rate then i suggest reading up on it.
I googled up anus scent. Didn't find much of anything having to do with fishing. At least fishing as per discussion.