gfy is probably the most up-to-date marketplace. the rest of the industry sites and boards are pretty much dead.
people come and go from the industry a lot now. there's way too many open mainstream gigs to be adult-only. i see a lot of designers and programmers disappear for 6-8 months to work a high pay mainstream gig, then come back and want to play in porn again.
there are quite a few adult services on Fiverr. You just have to search for the right keywords. this searched turned up a few adult designers, and a lot of designers that have no idea 'adult' means porn.
https://www.fiverr.com/search/gigs?u...adult+des ign
#porncms