Why not nudes in comparison scenes on paysites?

I’ve seem quite a lot of comparisons of body parts on pay sites.
But what makes me wonder is if there is anyone else but me who like to see some nudity on comparisons, or even lift & carry scenes. Sometimes I guess I’m the only one to want this, but I guess I’m not.
Sometimes, something more spicy happens. But, it’s all. It’s just a teaser of what might be. I’m pretty sure there’s a niche for that. I don’t believe that Amazon fetish can’t allow nude. Why someone doesn’t explore that niche that I believe it exists. Is it hard to convince amazons to pose nude? Maybe, I don’t know. Please, someone, tell me.
There are, for sure, naked comparisons on Japanese movies. But the mosaic ruins everything. And there are not F/f comparisons, what I like the most.
Thanks for anyone who can answer me.