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

Outdoor sex under the real stars

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

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Couples massage at a spa

Sex swing

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.

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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.

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

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

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Here is another list

Short (5 minutes or less) quickies

Golden enema

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New lingerie

Golden shower

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

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

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

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

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Induce squirting with the right techniques.

Play sexy truth or dare card games.

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.

Nude co-ed sauna. (Russian banya)

Sex on the beach

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Long (hour or more) marathons

Mutual massage which may or may not get erotic

Sex in public

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

Find porn or erotica that you both like.

Candle wax play

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Butt slapping as hard as they can take and enjoy.

Mood lighting. Try a sega Homestar planetarium projector

Mutual masturbation

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Meet other couples through a Lifestyle website.

Anal play

Titty fuck

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Sex in a pool

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

Write your own sexy truth or dare card games.

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Sex on the dining room table

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

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

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

Scented massage oils

Hot tubs

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Sex with other couples (or at least near them)

Temporary body paint

Prostate massage.

Long distance hot video chat with mutual masturbation.

TENS unit - electro shock

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