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

Sex in public

Long (hour or more) marathons

Mutual massage which may or may not get erotic

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Scented massage oils

Titty fuck

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

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Outdoor sex under the real stars

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.

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Couples massage at a spa

Sex with other couples (or at least near them)

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.

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Golden shower

Sex on the beach

Anal play

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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.

Candle wax play

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

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New lingerie

Sex in a pool

Play sexy truth or dare card games.

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Here is another list

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

Sex club - watch, be watched or fully participate

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TENS unit - electro shock

Find porn or erotica that you both like.

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

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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.

Hot tubs

Short (5 minutes or less) quickies

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

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

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

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

Temporary body paint

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

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

Meet other couples through a Lifestyle website.

Butt slapping as hard as they can take and enjoy.

Nude co-ed sauna. (Russian banya)

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

Mutual masturbation

Induce squirting with the right techniques.

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

Long distance hot video chat with mutual masturbation.

Write your own sexy truth or dare card games.

Mood lighting. Try a sega Homestar planetarium projector

Sex swing

Golden enema

Prostate massage.

Sex on the dining room table