I think perhaps it would be nice with custom tags.

I would like to block all content of sexual nature (sexual nudity, lewd anime, the like)

it is very subjective what is nsfw and what is not. For some people, making porn is their work, so obviously porn is not nsfw for them.

If we had custom tags, we would have the hassle of having the same thing in a lot of different categories, but I would much prefer that to having only the nsfw option which is just not enough to capture the diversity of content (and badly named).

then I could block all the porn tags (or perhaps block a user driven list of porn tags) and avoid a lot more “porn” than I do now 😅