I understand link building very well, but pbns are still new but I have to learn.
Link building in the adult niche is very expensive. You could blow 10k easy before you see any competitive results and no one will swap links with a new website.
I have found clean adult domains with links from newspaper, UNILAD, BBC News, top links for $10..
Building my own network is the only way this is realistic to make a good go at with without spending tens of thousands.
Also I'm willing to hire someone to help me. If you are a professional at PBNs, I'm open to talk