I run an adult relay at adult.18plus.social and UK laws apply so yes to FSSW as well as online, and no SESTA/FOSTA worries :-) I also sell my porn for sats at badbutlerxxx.com/shop using a getalby wordpress extention to avoid platform fees and rules :-)

Nostr is perfect for adult, we just need to bring everyone. My twitter is @PaulJonesAIR

cheers :-)