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Well they each have their own motivating systems. Karma, followers or money. Having been a reddit user for years I always find the rise and fall of gonewild posts making it to /r/all during the evenings fascinating. The NSFW content has it's time and place but never overtakes.

I'm pretty sure you should try to understand the difference between steem and steemit
In my opinion, it would be better building a specific NSFW website connected to Steem blockchain, and not using steemit.

Yea, i'm very new here so still trying to understand the difference between Steem and Steemit

There's no need for that. In the future we can expect to be able to filter both the tags we want to see and those we want to avoid. NSFW will probably be hidden by default.