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

Find porn or erotica that you both like.

Couples massage at a spa

Scented massage oils

Why is (n-1)(n+1)=n^2-1?

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

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.

Sex on the dining room table

Hallucinogens Linked to Milder PTSD - Neuroscience News

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

Titty fuck

Sex swing

Should you have a threesome with your best friend and your significant other if the significant other requests it?

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

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.

Sex with other couples (or at least near them)

How do I get fit at home?

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

Meet other couples through a Lifestyle website.

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

Who are the archers in Genesis 49:23?

Play sexy truth or dare card games.

Golden enema

Butt slapping as hard as they can take and enjoy.

Genetic and biological clues point to inflammation’s role in mental health - PsyPost

Anal play

Prostate massage.

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

You hold the door open for a lady and she stops in her tracks and screams at you, ‘Don’t hold the door for me! I’ll get it myself!’ What are your feelings or immediate reaction?

Long (hour or more) marathons

Candle wax play

Induce squirting with the right techniques.

Rogue Trader devs Owlcat are making an Expanse RPG with Mass Effect-style combat - Rock Paper Shotgun

Short (5 minutes or less) quickies

Write your own sexy truth or dare card games.

Mood lighting. Try a sega Homestar planetarium projector

Why do I want to give up on men?

Sex club - watch, be watched or fully participate

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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.

Column | How many years do I have left? An app gave me some helpful insights. - The Washington Post

Temporary body paint

Here is another list

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

US valley fever cases may be 18 times higher than reported - CIDRAP

Mutual masturbation

Nude co-ed sauna. (Russian banya)

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

Exclusive | Longevity Is Now a Factor When Picking an Embryo for IVF - WSJ

New lingerie

Sex on the beach

Sex in public

Are there girls here who like group sex?

Hot tubs

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

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

Scientists Just Discovered a Lost Ancient Culture That Vanished - 404 Media

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

Sex in a pool

TENS unit - electro shock

Why do most men who date ugly women brag like it's some big accomplishment, when any guy can pull an ugly woman?

Mutual massage which may or may not get erotic

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

Long distance hot video chat with mutual masturbation.

Golden shower

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

Outdoor sex under the real stars