"the only relevant measure of a sexual act, practice, or experience is the consent, pleasure, and well-being of the people engaged in it or the people affected by it"
That necessarily excludes the underaged and the trafficked as acceptable practices but does include prostitution assuming again that the people are of age and fully consenting.
All of us, I think, can name sexual practices that we find considerably unappealing to say the least. But are we going to delegate to ourselves the right to say to consenting adults that they cannot do them? And if so, why? Because WE dont like those sex acts? Why does what other adults do in private and find acceptable concern us? How is it even our business?
I was watching one of the talk shows 8-12 years ago or so and this couple was on that had a vomit fetish. They liked vomiting on each other. I probably dont need to say that this made me physically ill just to briefly think about. Should we make it illegal because we dont like the idea of those things? If we make that or prostitution illegal, where does it stop? It's easy to see a slippery slope between banning those two acts and making everything except unprotected missionary sex between straight married people illegal.