What are some fun/kinky things to do with your partner?

Mutual masturbation

Candle wax play

Fall asleep spooned up, coupled. Can you stay that way when you wake up?

Tahini Is The High Protein Food You Can Eat Every Day—With Almost Everything - Vogue

Sex swing

“Rescue” sex - partner lets go and is about to do something dangerous but hold them back at the last second. This takes trust.

Food play (sploshing) - including washing her off in the kitchen sink.

NASA Pulls the Plug on Europa Lander, but Scientists Propose a Plan B - Gizmodo

Snowball - cum inside her vagina, go down on her and suck it out, and then kiss her and shove your own spunk in her mouth.

Nude co-ed sauna. (Russian banya)

Sex with other couples (or at least near them)

Witness testifies that Diddy dangled her over a balcony - BBC

Long distance hot video chat with mutual masturbation.

Mutual massage which may or may not get erotic

Hot tubs

Why do men want to suck dick?

69

Butt slapping as hard as they can take and enjoy.

TENS unit - electro shock

Humans have evolved and become hairless and odor free. How do other races learn about evolution since evolution does not apply to them?

Anal play

Couples massage at a spa

Write your own sexy truth or dare card games.

Dinosaurs Had More Than Just Teeth—They Had Cancer, and It’s Changing Everything - The Daily Galaxy

Sex on a hard floor or rug rather than a soft bed

Outdoor sex under the real stars

Long (hour or more) marathons

Do many women shave their vaginas?

Forced hydration. Drink water during sex until you lose bladder control.

Induce squirting with the right techniques.

Play sexy truth or dare card games.

Mysterious sphere named Teleios found floating in the Milky Way - Earth.com

Hair play. (Cowgirl, brushing her long hair over his skin and face)

Meet other couples through a Lifestyle website.

A sexy walk in the park at night, when nobody else is around

Experiment Reveals What Prolonged Fasting Actually Does to The Human Body - ScienceAlert

Mood lighting. Try a sega Homestar planetarium projector

Temporary body paint

Golden shower

Star-shaped brain cells may underpin the brain's massive memory storage - Live Science

Bite hard on a tough part of you partner's body, like their heel without breaking the skin. Endorphin rush

Short (5 minutes or less) quickies

Find porn or erotica that you both like.

Special Wagers for Belmont Stakes Racing Festival - BloodHorse

Sex on the dining room table

Try different sex positions - Read and go through the Kama Sutra.

Sex in a pool

What was your most memorable experience catching a fraudulent car seller?

Take a sexy shower together. Soap makes pretty good anal lube and clean up is easy.

Titty fuck

Scented massage oils

Canibalism - eat a tiny piece of each other - typically a nip of you ass cheek. This may leave a small permanent mark, but it was in love.

Pregnancy play. Ask a woman who's stopped menstruating but wishes she could have more kids whether she wants a boy or a girl just before cumming inside her.

Sex on the beach

Sex club - watch, be watched or fully participate

New lingerie

Open her up with a speculum and see what's inside. Give her a mirror or take pictures for her.

Golden enema

Sex in public

Prostate massage.

Take a sensual shower together. Rub your soapy body all over theirs.

Here is another list

Sex with good friends but not lovers. Keeping the balance is tricky.