Clean landing page, no ad clutter, no popups. OnlyFans doesn't need to trick anyone into signing up, so the front door is quiet compared to most of this category.
Kink.com's landing page is quiet: no ad slots, no autoplay tricks, no wall forcing signup before you can look around. For a fetish network flagship, that's rare.
AllOver30 keeps its landing page quiet: no ad slots, no popunders, no redirect tricks. The only real complaint is that it doesn't adapt to a phone screen.
HuCows lands clean: no ad slots, no popunders, no redirect tricks, and the phone view actually works. For a free fetish site, that's rare enough to note.
BoundHub works fine as a free BDSM tube but the landing page carries a heavier ad load than it needs to — eight ad slots and a few known tracking hosts drag the grade down.
RedTube keeps the landing page reasonably restrained: no popunders, no autoplay sound, no redirect on first click. Ad and tracker counts are moderate, not egregious, which puts it comfortably in the mostly-clean tier.