Forums in the Adult Content Niche

1. VIX
Forum has 74,438 posts.
http://www.craftforum.com/  

2. BookandReader.com
Join our book forum today and share your experiences with people from around the world.
http://www.bookandreader.com/  

3. Home and Away Forum | Back to the Bay
https://www.backtothebay.net/forum/  

4. Spine-health
Spine-health.com is the leading resource for comprehensive, highly informative and useful information on understanding, preventing, and seeking appropriate treatment for neck and back pain. It...
http://www.spine-health.com/forum/  

5. Book Club Forum
http://www.bookclubforum.co.uk/community/  

6. #1 PUA
WARNING: This is the biggest PUA forum in the pick up artist community. With proven advice & thousands of members - 100% Free Membership!
https://www.pick-up-artist-forum.com/  

7. CTC Forum
Forum has 1,447,795 posts.
https://forum.ctc.org.uk/index.php  

8. Anime Superhero Forum
Forum has 3,997,085 posts.
http://www.toonzone.net/forums/  

9. www.thelion.com
The Wall Street of Stock Trading and Investing Financial Community Site for Traders and Investors. Free stock quotes, news, research, message postings, stock picks, chat rooms, and financial...
https://www.thelion.com/bin/forum.cgi  

10. Akiba-Online
Akiba-Online Japanese Culture Community
http://www.akiba-online.com/forum.php  

11. SkinAlley | Discuss Skin Care, Beauty and Hair Issues
SkinAlley is a Skin Care, Beauty and Hair Forum to Discuss Skin, Beauty and Hair Related Topics
https://www.skinalley.com/  

12. Acne.org
Science-based information about acne and its treatments. Reviews on acne products and treatments. Active and friendly community. Home of The Acne.org Regimen. Includes a store to buy Acne.org...
http://www.acne.org/messageboard/  

13. SparkPeople
SparkPeople's tools and content will help you find the right path, but our Community will help keep you on that path. Get motivation and support while having fun meeting others like you who are...
https://www.sparkpeople.com/myspark/mycommunity.asp  

14. The Alcoholism and Addictions
Online Support Groups for Addicts, Alcoholics and their Family, Friends and Loved Ones.
https://www.soberrecovery.com/forums/  

15. Final Fantasy Republic Forums
Final Fantasy Republic is dedicated to bringing Final Fantasy fans together and keeping them up-to-date on the latest news and content concerning anything Final Fantasy. Feel free to join our...
http://forums.ffrepublic.com/  

16. Acne.org
The largest, most trusted online forums for acne-prone people to learn, share​ ​their ​knowledge, and support one another.
https://www.acne.org/forums/  

17. Science Fiction & Fantasy forum
SFF Chronicles: science fiction & fantasy community forums
http://www.sffchronicles.co.uk/forum/  

18. Internet Explorer cannot displ
http://bbs.stardestroyer.net/  

19. Ultimate Subaru Message Board
Welcome to the USMB - the Subaru forum with the most history and the best content on the entire planet.
https://www.ultimatesubaru.org/forum/  

20. HYPEBEAST
Hypebeast is the leading online destination for men's contemporary fashion and streetwear. Shop at our store and also enjoy the best in daily editorial content.
http://hypebeast.com/forums/  

21. Joomla!
Just made it into the top 50!
https://forum.joomla.org/  

22. RadioDiscussions
Where everyone discusses the Broadcast Media
https://www.radiodiscussions.com/  

23. Forum Topics
https://www.steptalk.org/forum/  

24. www.lumberjocks.com
https://www.lumberjocks.com/forums/  

25. Tactical Gamer
Tactical Gamer is the PREMIERE mature online gaming community. We feature games such as PlanetSide 2, Battlefield 3, Armed Assault (ARMA2), Natural Selection 2, DayZ, and more. Our community is...
http://www.tacticalgamer.com/forum.php  

26. affLIFT
Affiliate marketing forum filled with over 50,000 affiliates and exclusive guides, case studies, and example affiliate marketing campaigns!
https://afflift.com/f/  

27. OnlineBookClub.org
Discussion Forums about Books and Reading
https://forums.onlinebookclub.org/  

28. Forums Forums
Forums Forums - Off Topic Forum FUN
http://www.forumsforums.com/3_9/  

29. Geocaching Forums
https://forums.groundspeak.com/GC/  

30. Talk Tennis
Talk Tennis - Tennis Warehouse
http://tt.tennis-warehouse.com/  

31. www.ironmagazineforums.com
Bodybuilding and Anabolic Steroid Discussion Forums.
https://www.ironmagazineforums.com/  

32. Labradors Forums
A forum community dedicated to Labrador owners and enthusiasts. Come join the discussion about breeds, health, behaviour, housing, adopting, care, classifieds, and more!
https://www.labradorforums.co.uk/forums/  

33. TableTennisDaily
Forum has 6,198 topics.
https://www.tabletennisdaily.co.uk/forum/forum.php  

34. AllTrails.com
Search over 300,000 trails with trail info, maps, detailed reviews, and photos curated by millions of hikers, campers, and nature lovers like you.
http://www.everytrail.com/forum/  

35. SAAustralia Forums
https://www.saaustralia.org/  

36. happiness.com
https://www.happiness.com/forum/  

37. Talk Whatever Online
Fans of Cult Entertainment
https://www.talkwhateveronline.com/  

38. WebRats Fun and stupidity at i
Forum has 2,676,550 posts.
https://forums.webrats.com/  

39. Affiliate Marketing Forum | AffiliateFix
Affiliate Marketing Forum | AffiliateFix. The number one Affiliate and CPA marketing forum online. Affiliate Networks and more.
https://www.affiliatefix.com/  

40. Keeptouch Community Portal
Keeptouch Community Portal is an online community based in Singapore, offering a place for exchange of ideas and information in a wide range of topics in the form of forum discussions and Internet...
http://forums.keeptouch.net/  

41. Festival Forums
Forum has 1,530,774 posts.
https://www.efestivals.co.uk/forums/  

42. SkyscraperPage
Forum has 45,602 members.
https://forum.skyscraperpage.com/  

43. skyscraperpage.com
SkyscraperPage.com's discussion forum is one of the world's most active community discussion portals for skyscraper, urbanism and building enthusiasts. Featuring coverage of the world's projects,...
https://skyscraperpage.com/forum/  

44. KiasuParents
Forum has 1,895,716 posts.
https://www.kiasuparents.com/kiasu/forum/  

45. All About Jazz
All About Jazz covers the world of jazz music, with interviews of top musicians and bands, albums reviews, free music, videos, photos, and news.
http://forums.allaboutjazz.com/  

46. TopGoldForum.com
https://topgoldforum.com/  

47. KTMTalk.com
This is a discussion forum for owners of KTM's.
https://www.ktmtalk.com/  

48. Tenerife
The BIGGEST online community chat forum and information travel guide for tourists visiting and residents living in or moving to Tenerife
https://www.tenerifeforum.org/tenerife-forum/forum.php  

49. NamePros
Buy, sell, learn, and discuss domain names with the largest domain forum community in the world. Stay informed with the latest domain news.
http://www.namepros.com/  

50. The Depression Forums
Depression Forums is the Internets biggest peer to peer depression support forum. Here you can find information on depression related medications and general depression related discussion from...
http://www.depressionforums.org/forums/