I don't blame you. "sub" has become a very ambiguous term:

• subscriber
• submissive
• submarine
• subway sandwich

(and probably more)

Reddit migrant here, looking for some rough equivalents of what we have/had over there. Not sure how much my suggestions are worth, considering I'm purely a fetishist, and not really into nudity (or anything involving intimate areas), which makes my existance on a purely NSFW platform questionable... :P

• BDSM:
  • General discussion board
  • Memes (r/bdsmmemes)
  • Content sharing boards:
    • Bondage (maybe even with specializations like)
      • Straitjackets (r/straitjacketbondage)
      • Armbinders (r/armbinders)
      • Sleepsacks
      • Vacuum Beds (r/vacbeds)
• Latex:
  • Latex clothing
  • Shiny bondage (r/shinybondage)

I'd probably actively participate in the BDSM discussion board, and have some OC bondage and latex content I could share, should appropriate communities arise.