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

Prostate massage.

Temporary body paint

Anal play

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Sex with other couples (or at least near them)

Sex on the beach

Short (5 minutes or less) quickies

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Sex swing

Here is another list

Golden enema

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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.

Mutual massage which may or may not get erotic

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

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Sex in public

Play sexy truth or dare card games.

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.

Mutual masturbation

Candle wax play

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TENS unit - electro shock

Sex club - watch, be watched or fully participate

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

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Titty fuck

Long (hour or more) marathons

Hot tubs

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Sex in a pool

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

Has anyone ever participated in a gang bang and what was it like?

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

Meet other couples through a Lifestyle website.

Nude co-ed sauna. (Russian banya)

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

Scented massage oils

Mood lighting. Try a sega Homestar planetarium projector

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Long distance hot video chat with mutual masturbation.

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

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

Write your own sexy truth or dare card games.

Golden shower

Outdoor sex under the real stars

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

Sex on the dining room table

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

Find porn or erotica that you both like.

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

Butt slapping as hard as they can take and enjoy.

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

New lingerie

Induce squirting with the right techniques.

Couples massage at a spa

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

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