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

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

Scented massage oils

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Why is the concept of pumping water uphill not commonly used as a source of electricity generation, similar to pumped-hydro systems?

Couples massage at a spa

Sex swing

Sex in public

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

TENS unit - electro shock

Prostate massage.

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.

Is it ethical for same-sex couples to raise children?

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

Temporary body paint

Here is another list

Is crossdressing being a transvestite?

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

Sex on the beach

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

Scientists have discovered a hidden city 140,000 years old at the bottom of the ocean. - Farmingdale Observer

Long (hour or more) marathons

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

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

Weed Could Be Wrecking Your Heart – Study Uncovers Dangers of Smoking and Edibles - SciTechDaily

Candle wax play

Sex with other couples (or at least near them)

Find porn or erotica that you both like.

Why is there so much free porn on the internet?

Mutual masturbation

Induce squirting with the right techniques.

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.

Why does my girlfriend keep asking me if I love her?

Mood lighting. Try a sega Homestar planetarium projector

Titty fuck

Sex on the dining room table

‘We’re right at the epicenter’ - Meduza

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

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

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

Men are more likely than women to die of broken heart syndrome, study finds - CNN

Outdoor sex under the real stars

Long distance hot video chat with mutual masturbation.

Sex club - watch, be watched or fully participate

Nude co-ed sauna. (Russian banya)

Sex in a pool

New lingerie

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

Short (5 minutes or less) quickies

Golden shower

Write your own sexy truth or dare card games.

Butt slapping as hard as they can take and enjoy.

Golden enema

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

Anal play

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

Play sexy truth or dare card games.

Meet other couples through a Lifestyle website.

Hot tubs

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.

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

Mutual massage which may or may not get erotic