I was also confused by the no porn thing as I see a lot of it being posted and being rewarded and by high authority steemians as well.
I don't really come to Steemit for porn lol but IMHO if your going to post porn at least make it your own photos or your own porn, if I want to see general internet porn I'll head over to pornhub or youporn we dont really need it reposted here unless its going to be some type of curation like the 100 best bl@wj@b3 of all time and even then that's questionable lol.
XD
It might be questionable to you ;)
But yeah, the folks here on steem who are making the money doing that are doing the artsy stuff themselves.
Not that I know much about it or anything.
the #nsfw tag is a thing though.