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I remember reading a comment a while ago (on Reddit, ironically) which pointed out that SFW subreddits naming themselves [subject]porn are borrowing the wrong part from the word "pornography". "Porn" is from greek pornē meaning "prostitute", but the suffix -graphy means "to write" and is often used to indicate "the study of" the thing it's attached to (e.g. geography, cryptography, demography, etc.)
It would be more accurate, and perhaps less controversial, if these communities named themselves earthography, spaceography, unixograpy, etc. As an added bonus, the -grapy suffix is also prominent in "photography" which is appropriate considering that many of these communities are places where people share photos of the subject matter.
I think you're missing the point of the -porn suffix. Its not supposed to convey "the study of" or "images of". Its meant to convey that viewing it is satisfying in some primitive/emotional/aesthetic way. NaturePorn isn't just "pictures of nature", it's "pictures of nature that suck me in and make me want to see more". In that regard, the comparison to sex is intentional.
JusticePorn is definitely not a study on justice
We need an Astrography community