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

Temporary body paint

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.

Couples massage at a spa

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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.

Write your own sexy truth or dare card games.

Nude co-ed sauna. (Russian banya)

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Outdoor sex under the real stars

Scented massage oils

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

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Mutual masturbation

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

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

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Sex on the beach

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

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

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Mutual massage which may or may not get erotic

Short (5 minutes or less) quickies

Meet other couples through a Lifestyle website.

If my heart stopped beating, would I have enough energy to walk out into the other room 20 ft away before I passed out and died?

Butt slapping as hard as they can take and enjoy.

Mood lighting. Try a sega Homestar planetarium projector

Golden shower

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Sex with other couples (or at least near them)

Sex swing

Hot tubs

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Titty fuck

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

Induce squirting with the right techniques.

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TENS unit - electro shock

69

Sex in public

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Anal play

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

Find porn or erotica that you both like.

Play sexy truth or dare card games.

Prostate massage.

Candle wax play

Golden enema

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

Sex in a pool

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

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

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.

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

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

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

Long distance hot video chat with mutual masturbation.

New lingerie

Here is another list

Sex on the dining room table

Sex club - watch, be watched or fully participate

Long (hour or more) marathons