Ko-Fi is honestly super nice. I've used it for a couple years now. It has a monthly supporter system, a shop, the ability to set up commissions paid through them. And if you pay $6 a month, you get gold, which takes out the fees (Allowing you to get everything from your sales with nothing taken out which can save a lot of money in the long run)

Ko-fi don't allow NSFW as far as I am aware... but they do have the ability to mark your page as for adult audiences.

Gumroad is, indeed, janky as FUCK. xD I can't even log in to my account anymore. I don't even know why, it won't accept my password and when I go to reset the password, that fails too. So I kinda gave up on it.

I love my Kofi page, it made it super easy to organize all my commission types and create links for those wanting to order pieces. While I don't post regularly there, just having as a commission ordering platform has been a lifesaver.

Kofi seems pretty easy. I look forward to checking your account out once you set it up!