I have been curious about this for awhile. What's the motivation behind posting porn to sites like phuks, voat and Reddit? Is there sexual gratification to it? Does the poster get aroused from knowing people might be masterbating to their post? Is it to bookmark your favorite porn? With so much porn available for free across the internet why share it?
For me, it's probably worth noting I've not posted anything to either Reddit or Voat.
It's pretty straight-forward; it's not fundamentally different than sharing links to any other interest. It's something you like and are into, and wouldn't it be nice to talk about it with someone?
I got back in touch with an old friend today, and spent some time at his house. He's had the good fortune to be able to meet some hentai artists and people in the field. Taking some time to chat about the artists we like and makes them neat, is not that different than anything else.
I don't get any sense of arousal or gratification, outside of just someone else genuinely liking what I had to post (which is the same no matter the content I post).