Not sure if you're kidding, or inviting serious replies, but I'll put in my two cents.
As a gay man, that came out pre-aids, I've seen just about everything one could imagine, of a sexual nature. I personally have failed to understand what bodily waste and sex have in common, even though I've witnessed the act many times at various sex clubs. And my attitude to this day is...far be it for me to tell anyone what two consenting adults should and should not do. That being said, there is a real danger in jumping down that particular rabbit hole. Beside the obvious physical dangers (hepatitis, etc..), there is an emotional cost as well. I've known many regular guys who got sucked into that void, never to return.
I'm a firm believer that not every sexual fantasy needs to be fulfilled. It's also my personal opinion that sex and degradation are a dangerous combination.
Now I'm no choirboy. I've had group sex, anonymous sex, voyeuristic sex, interracial sex, etc... And I've had literally hundreds of sexual partners. But in all my sexual experimentation, I honestly have to say that the best sex was always of a romantic, passionate and mutual respectful nature. Try to remember that porn is porn, and not real life. Just my opinion.