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

Anal play

Find porn or erotica that you both like.

Mutual masturbation

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Write your own sexy truth or dare card games.

Outdoor sex under the real stars

Nude co-ed sauna. (Russian banya)

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

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TENS unit - electro shock

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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.

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

Sex club - watch, be watched or fully participate

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Sex with other couples (or at least near them)

Long (hour or more) marathons

Butt slapping as hard as they can take and enjoy.

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Here is another list

Long distance hot video chat with mutual masturbation.

Couples massage at a spa

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Titty fuck

Scented massage oils

Mutual massage which may or may not get erotic

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Golden enema

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

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Play sexy truth or dare card games.

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

Sex on the dining room table

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

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

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

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

Sex swing

Temporary body paint

Short (5 minutes or less) quickies

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

Sex on the beach

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

Sex in public

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

Induce squirting with the right techniques.

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 in a pool

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

Mood lighting. Try a sega Homestar planetarium projector

Hot tubs

Prostate massage.

New lingerie

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.

Candle wax play

Golden shower

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