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

Short (5 minutes or less) quickies

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

Couples massage at a spa

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Scented massage oils

Butt slapping as hard as they can take and enjoy.

Induce squirting with the right techniques.

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New lingerie

Write your own sexy truth or dare card games.

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Titty fuck

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

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

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Find porn or erotica that you both like.

Sex club - watch, be watched or fully participate

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

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Play sexy truth or dare card games.

Meet other couples through a Lifestyle website.

Prostate massage.

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

Golden enema

Long (hour or more) marathons

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Mood lighting. Try a sega Homestar planetarium projector

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.

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

Is crossdressing being a transvestite?

Sex with other couples (or at least near them)

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

Mutual massage which may or may not get erotic

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

TENS unit - electro shock

Anal play

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Golden shower

Nude co-ed sauna. (Russian banya)

Mutual masturbation

Hot tubs

Temporary body paint

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.

Outdoor sex under the real stars

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

Sex on the dining room table

Sex in public

Sex in a pool

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

Long distance hot video chat with mutual masturbation.

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

Candle wax play

Sex swing

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.

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

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

Here is another list

Sex on the beach