Sexuality Kinks
Polyamory & Polysexuality
While "poly" relationships (polyamorous, polysexual, polyplayful etc.) aren’t necessarily kinky in the traditional sense, lots of folks consider them “alternative.”
Articles
Dos and Don’ts for Polyamory, on More Than Two
My Top Advice for New Polyamorous People, on Ready for Polyamory
Books
The Ethical Slut, Third Edition: A Practical Guide to Polyamory, Open Relationships, and Other Freedoms in Sex and Love, by Janet W. Hardy and Dossie Easton
The Jealousy Workbook: Exercises and Insights for Managing Open Relationships, by Kathy Labriola
More Than Two Essentials (10 books), by various authors
Ready for Polyamory: A Pragmatic Guide to Consensual Non-Monogamy, by Laura Boyle
Sex at Dawn: How We Mate, Why We Stray, and What It Means for Modern Relationships, by Christopher Ryan and Cacilda Jetha
The Smart Girl's Guide to Polyamory: Everything You Need to Know About Open Relationships, Non-Monogamy, and Alternative Love, by Dedeker Winston
FetLife Groups
Ethical Polyamory (Multi-Partnerships)
Websites
General
Articles
How to Correctly Clean and Store Your Sex Toys, on Healthline
How to Give a Blowjob that Blows Their Mind, on Kink Store
How to Use a Cock Ring Safely and Simply, on Kink Store
Sex and Disability: Several Types of Disability, on Kink Academy (free)
Books
Cuffed, Tied, and Satisfied: A Kinky Guide to the Best Sex Ever, by Jaiya
Kinky History: A Rollicking Journey through Our Sexual Past, Present, and Future, by Esmé Louise James
101 Kinky Things Even You Can Do, by Kate Sloan
Your Blueprint for Pleasure: Discover the 5 Erotic Types to Awaken―and Fulfill―Your Desires, by Jaiya
Videos
The Blueprint Breakthrough by Jaiya and Ian: YouTube channel for vanilla and kinky sex topics
Reid About Sex: YouTube channel for vanilla and kinky sex topics
The Safer Sex Elevator Speech, on Kink Academy (free)
Telling a Partner About a Chronic Sexual Condition, on Kink Academy (free)
Websites
Bad Girls Bible: vanilla and kinky sex topics
Kinkly Blog: vanilla and kinky sex topics
ReidAboutSex.com: vanilla and kinky sex topics
Velvet Lips: sex-positive sex education venue offering workshops and intensive coaching
Sacred Sexuality & Sex Magick
Again, not necessarily kinky in the traditional sense, but considered to be on the "alternative" end of the spectrum
Articles
10 Sacred Sexuality Practices To Spiritualize Your Love Life, on Tantric Academy
RW 142 – Sacred Sexuality 101: The 5 Elements of the Direct, Challenging, Enlightening Path of Tantra, on Rewilding for Women
Books
Sacred Sex: The Magick and Path of the Divine Erotic, by Gabriela Herstik
Sex Shamans: True Stories of Sacred Sexuality and Awakening, by KamaliDevi McClure
Sex, Sorcery, and Spirit: The Secrets of Erotic Magic, by Jason Miller
FetLife Groups
Videos
Sacred Sexuality 101 (Forget Sex): Shadow Work, Divine Union, Masculine & Feminine, Self Love & More, by ReWilding with Sabrina Lynn
Sacred Sexuality 101: Radically Transform Your Sex Life, by Layla Martin
Anal
Articles
Anal Beads 101: A Step-by-Step Guide to Using Them Safely and for Maximum Pleasure, on V for Vibes
Everything You Need to Know About Anal Sex Safety, on Healthline
Some practical tips for sticking things up your butt, on Ovee
Books
Anal Pleasure and Health: A Guide for Men, Women and Couples, by Jack Morin
Butt Seriously, by Evan Goldstein
The Ultimate Guide to Anal Sex for Men, by Bill Brent
The Ultimate Guide to Anal Sex for Women, by Tristan Taormino
Videos
How to Prep for Anal Sex: First Time Tips and Tricks For Getting Your Booty, Body & Mind Ready, by Hello TUSHY Bidet
9 Things NOT to do during Anal Sex (health and safety tips), by Hello TUSHY Bidet
Bukkake
Articles
Bukkake, on Kinkly
How to Host a Bukkake, on Hush
FetLife Groups
Facials-Cumplay-Bukkake-Etc...
Chastity
Cuckolding
Articles
What Is Cuckolding? Sex Experts Explain Everything You Should Know, on Men’s Health
Here’s What to Know About Cuckold Relationships, on VeryWellMind
Books
Cuckold Conversion Kit — For Wives: Ethically Getting Him To Want And Need A Tiny Cuck Status, by Allora Sinclair
DNA of a Cuckold — Advanced Couples Edition, by Allora Sinclair
Erotic Cuckolding: The Real Guide for Couples, by Emma Kelly and Scott Kelly
FetLife Groups
Videos
Cuckolding | Sex Education, by Femme Forth
7 Tips for Cuckolds, by Beauty Ray
Fisting
Articles
Beginner’s Guide to Fisting, on UberKinky
How to Do Vaginal Fisting the Right Way, According to People Who’ve Tried It, on Men’s Health
25 Tips for Your First Fist, on the Advocate
FetLife Groups
Videos
THE ECSTATIC ART OF ANAL FISTING | How to Anally Fist Your Partner in 8 Easy Steps, by Helena Nista
Forced Orgasm
Articles
Climax Like a Boss: Your Guide to Safe and Fun Forced Orgasms, on Greatist
FetLife Groups
Orgasm Control Conditioning of Females
Orgasm Control for male subs/slaves
Videos
Kink 101: Forced Orgasms! Orgasm Training, by Kinky Sam Jones
Gangbangs
Articles
Gang Bang 101, on Slut Lessons
How to Organize a Gangbang, on VICE
What to Expect from a Real Gangbang, on SwingTown
FetLife Groups
Orgies
Articles
Guide to Orgies: How to Participate in an Orgy, on MasterClass
How to Have a Sex Party, on VICE
Books
The Sex Party Handbook: Your Ultimate Guide to the World of Orgies, Sex Clubs and More (and How to Host Your Own), by Ali Bushell
FetLife Groups
Seems like a lot of personals and location-specific groups but no discussion group
Mutiple Penetration
Articles
A Beginner’s Guide to Double Penetration, on Healthline
Double Penetration Comprehensive Guide, on V forVibes
The 15 Best Tips for Double Anal Penetration, on b-Vibe
FetLife Groups
Videos
Orgasm Denial
Pegging
Articles
What Is Pegging And How Do You Actually Make It Feel Good? on Women‘s Health
What Is Pegging? Complete Pegging Guide For Maximum Enjoyment, on Bad Girls Bible
Books
The Pegging Book: A Complete Guide to Anal Sex with a Strap-On Dildo, by Cooper Beckett and Lyndzi Miller