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

Mutual masturbation

Hot tubs

Mood lighting. Try a sega Homestar planetarium projector

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Titty fuck

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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Prostate massage.

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

Scented massage oils

Molestiae quas aut aut quisquam eum aut.

TENS unit - electro shock

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

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

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Induce squirting with the right techniques.

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

Mutual massage which may or may not get erotic

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Sex on the beach

Sex swing

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

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

Sex in public

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

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Candle wax play

Anal play

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

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Here is another list

Long (hour or more) marathons

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

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Golden enema

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

Nude co-ed sauna. (Russian banya)

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Butt slapping as hard as they can take and enjoy.

Sex with other couples (or at least near them)

Outdoor sex under the real stars

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Long distance hot video chat with mutual masturbation.

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.

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

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Write your own sexy truth or dare card games.

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

Play sexy truth or dare card games.

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Sex club - watch, be watched or fully participate

New lingerie

Sex on the dining room table

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Golden shower

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.

Short (5 minutes or less) quickies

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

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Meet other couples through a Lifestyle website.

Sex in a pool

Temporary body paint

Find porn or erotica that you both like.